Space Invaders · mimo-v2.6-flash

Let me build the game. Single file index.html.

Plan: canvas game with procedural graphics (draw aliens with rects/pixels, bunkers as pixel grids).

Let me write it carefully.

Key features:
- Controls: Arrow keys/A/D move, Space fire. Display controls text.
- Alien grid: moves horizontally, reverses and descends at edges, fires at player.
- Player shots remove aliens, score once.
- Bunkers: destructible, e.g. 22x16 pixel grid cells; hits from either side remove material persistently.
- Lives: 3, enemy shots cost a life with brief invulnerability (blink). Aliens reaching player zone (y >= player line) or lives 0 => Game Over. Clearing aliens => win.
- Restart restores everything. Bounded projectile lifetime (max age) and fire rate (cooldown).
- Visual feedback: score popup, explosion particles, screen flash.

Let me write the code.

Canvas size: 900x640? Use fixed internal resolution, scale with CSS.

Layout: playfield top HUD, alien formation, bunkers at y ~ 500, cannon at y ~ 590.

Aliens: 10 cols x 5 rows, sizes vary by type. Animation: 2-frame procedural sprite drawn from pixel matrices.

Alien sprites as 12x8 bitmaps? Let's define three alien types with pixel art strings.

Type 0 (top row, 8 pts): squid-like
Type 1 (middle 2 rows, 10... actually classic: top=30, mid=20, bottom=10). Use top=30, mid=20, bottom=10.

Let me write pixel art 11x8:

Squid (11x8):
```
00011000000 -> hmm let me do standard
```
Standard squid 8x8:
```
00011000
00111100
01111110
11011011
11111111
00100100
01011010
10100101
```
Crab 11x8:
```
00100000100
00010001000
00111111100
01101110110
11111111111
10111111101
10100000101
00011011000
```
Octopus 12x8:
```
000011110000
011111111110
111111111111
111001100111
111111111111
001110011100
011001100110
110000000011
```
And frame 2 variants (legs moved). I can just flip legs by shifting bottom rows. Simpler: draw frame 2 by modifying bottom row pattern: shift legs. I'll create second frames manually or programmatically: for frame 2, move the bottom row legs outward/inward by translating bits. Simple approach: frame2 = same sprite but swap the two bottom rows shifted? Eh. Just define two frames per alien as strings — it's fine, a bit of typing.

Alternatively animate by offsetting alternate columns — meh. I'll define frames.

Actually a simpler trick: frame 2 = frame 1 mirrored horizontally for symmetric sprites plus leg swap: take bottom row and rotate left by 2 bits. That gives visible motion. I'll do: frame2 = rows with bottom two rows bit-rotated by 2. Good enough visually? Leg motion should be visible. Fine.

Let's just hand-write frame 2 for each with legs shifted:

Squid frame2:
```
00011000000 -> keep top 5 rows same, change last 3 rows:
11011011 (same)
00100100 -> same? 
01011010 -> 10100101
10100101 -> 01011010
```
So swap last two rows. That gives an obvious 2-frame animation. For crab, swap last two rows similarly; octopus too. Plus maybe move legs. Good — simple and clearly animates.

Explosion sprite for alien death: draw a burst of procedural particles instead.

Bunkers: grid of cells, e.g. width 46 cells? Bunker: 56x40 px composed of 4x4 px cells → 14x10 cells. Classic shape: arch at bottom. Store Uint8Array of 14*10. On hit at (x,y) radius r, clear cells in radius. Persistent.

Shot hits bunker: check cells; if hit, damage radius ~2 cells (8px) from top of impact for player shots, from bottom for enemy shots. Actually classic: player shot damages a small area; let's use radius 1.5 cells for player, 2 for alien. Add scorch visual.

Collision: bullet vs bunker — sample bullet position; if cell present → hit.

Alien shooting: pick random bottom-most alien in a random column, spawn bullet. Fire rate increases as fewer aliens remain. Bullets aimed slightly toward player? "fires toward the player" — bottom aliens fire downward, with slight horizontal drift toward player x (limited). I'll give vx = clamp((playerX - alienX)/something).

Player: invulnerability timer after hit (2s), blinking.

Game states: 'playing', 'gameover', 'win', plus maybe 'ready'. Start immediately playing.

Restart button: HTML button + R key.

HUD: Score, Hi-score?, Lives, Controls text.

Feedback: score popup floating text "+30", hit flash, screen shake.

Let me write the file now.

Structure:

```html
<!DOCTYPE html>
<html>
<head><meta charset><title>...
<style> ... </style>
</head>
<body>
<div id="wrap">
 <header> score / lives / controls </header>
 <canvas id="game" width="900" height="640"></canvas>
 <div id="overlay"> message + restart </div>
</div>
<script> ... </script>
</body>
```

Canvas coordinates: W=900, H=640. HUD drawn in DOM above canvas. Playfield inside canvas: player y = H-46, bunkers y = H-150, alien formation area top y=60, player zone line = H-160 (aliens reaching that → game over). Actually alien reaching "player zone": alien bottom >= bunkerTop-ish or >= H-140.

Alien formation: cols=11, rows=5. cellW=56, cellH=44, sprite scale 3 (sprites 11 wide → 33px). Formation width 11*56=616, start x=(900-616)/2=142. Speed: base 24 px/s, increases as aliens die. Direction ±1. Descend 24px.

Alien-to-edge bounce: if dir>0 and right edge >= W-10 → reverse and descend.

Alien sprites drawn at alien.x = formationX + col*cellW + (cellW - spriteW)/2.

Bullet: player bullet speed -520 px/s, size 3x12. Alien bullet 3x10 speed 260.

Fire cooldown: 0.35s. Bullet lifetime: max 1.6s player, 3.5s alien → remove when off-screen or age > max.

Collision detection: rect overlap.

Particles: explosion sparks.

Let me write code.

Draw alien: for each pixel in sprite matrix where '1', fillRect(x+c*s, y+r*s, s, s). With color per row type. Add slight glow.

I'll write the full script now.

Also draw starfield background (procedural), ground line.

Player cannon procedural: base + barrel drawn with rects/paths.

Explosions array: {x,y,parts:[...], t}.

Score popups: {x,y,text,t}.

Shake: shakeT.

Let me handle keydown: preventDefault for arrows/space.

Game loop with requestAnimationFrame, dt clamp.

Restart: reset all state.

Overlay: shown for gameover/win with message and Restart button.

Also "play again" on win.

Edge case: score increase once per alien — aliens removed from array/set, so fine. Track score per type.

Lives display: draw small cannons in HUD DOM? I'll render lives as spans of ▸ or draw in canvas HUD. DOM: `♥`? Better: draw cannon icons via inline SVG? No external... inline SVG is fine (not a resource). Simpler: text "CANNON ×3" or little divs styled as triangles. I'll use a small inline SVG icon repeated. Actually keep simple: DOM spans with CSS shape.

I'll do lives as small CSS-drawn cannons: a div with clip-path triangle-ish. Fine.

Let me write it.

Bunker shape: cells 14 wide x 10 tall, cell size 4 → 56x40. Three bunkers at x = 140, 422, 704 (spacing). Arch: rows 0-6 full width except top corners rounded; bottom middle cut out (arch). Let's define mask:

For each cell (c,r):
- skip if outside rounded shape: top corners: if r < 2 and (c < 2-(r) ... ) let's do: if r===0 and (c<3 || c>10) skip; if r===1 and (c<1 || c>12) skip;
- arch at bottom: rows 7..9: if c>=4 && c<=9 → skip (arch opening), and row 6: if c>=5&&c<=8 skip to curve.

Good.

Bunker positions: bunkers at y = H - 170 (=470). Player at y = H-50. Alien descend limit: game over when alien bottom >= y of bunkers top (470)? Classic: aliens reaching the player's row. I'll use alienBottom >= playerTop - 4 → game over. But also they'd shoot bunker. Set invasion line = bunkers y + 50 maybe. Requirement: "Aliens reaching the player zone ... causes Game Over". I'll define playerZoneY = H - 120 and draw a dashed "PLAYER ZONE" line; game over when alien bottom >= playerZoneY.

Hmm, bunkers at 470, zone at 520, player at 590. Bunkers between cannon and aliens ✓.

Let's compute: H=640. player y top = 596, height 34 → bottom 630? Ground at 632. Player top = 600, height 32. Zone line y = 545. Bunkers y = 470..510. Player zone between 545 and ground. Aliens descend 5 rows × 24 = 120 from start y=70 → 190, plus descents. They need many descents to reach 545 — that's fine, speed increases.

Actually invasion detection: alien y + spriteHeight >= 545.

Alien formation start y = 64.

Let me now write.

Alien fire: interval based: every (0.9 + random*0.8) seconds scaled by 1/ (remaining/55) ... compute: fireInterval = clamp(1.6 * remaining/55 + 0.35, 0.35, 2.0). Something like base 1.4 * (0.35 + 0.65*remaining/total). Ok.

Max alien bullets on screen: cap ~ 8 + ...

Alien bullets lifetime max 4s.

Player hit → lives--, invuln=2.2s, if lives 0 → gameover. Also clear enemy bullets near? Not necessary.

Collision player bullet vs alien: iterate aliens (array of objects with alive). On hit: alien.alive=false, score += pts, popup, explosion, shake small.

Player bullet vs bunker: handled before alien check.

Bullet vs bullet: optional, skip (or allow). Skip.

Alien bullet vs player: if !invuln → hit.

Player bullet vs bunker: sample collision: for bullet rect, check overlapping cells; if any solid → damage at impact point (center of bullet top for player shot? Just center) radius.

Damage bunker: clear cells within radius R (in cells): for player R=1.6, alien R=2.0? Actually player shot from below damages upward... For visual, clear cells within radius around impact, plus push 1 cell in direction of travel (so erosion goes through). Player shot moving up → damage cells at/above impact. Alien shot moving down → damage at/below.

Implementation: impact point = bullet center. cells within dist <= R cleared. Then also clear one extra cell in direction of travel at that distance. Simple: R=1.8.

Store bunkers as {x,y,cols,rows,cell,data:Uint8Array}.

Draw bunker: for each solid cell, fillRect with green color, slight variation.

Shots passing through gaps: since cells removed persistently, collision check per-cell works.

Now, the visuals: neon green classic look. Colors: aliens white/cyan/magenta? Classic invaders: green. I'll use: type0 magenta? Let's do palette: #7CFF6B green for all aliens with slight variation: row0 #ff5c8a? Hmm classic Space Invaders all white/green. I'll use: top rows #b98cff? Keep it tasteful: aliens in #6bff9e with glow, bunkers #38e07a, player #6bffce, bullets: player white-yellow, alien #ff6b6b.

Let's write the code now.

Also need "Display the controls" — HUD text: "←/→ or A/D — Move   SPACE — Fire   R — Restart".

Restart button in overlay + also a Restart button always visible in HUD. Requirement: "Provide Restart". I'll put a Restart button in the HUD always.

Now writing.

```js
const canvas=document.getElementById('game');const ctx=canvas.getContext('2d');
const W=900,H=640;
```

Sprites:

```js
const SPRITES={
 squid:[
 ["0001100000"... ]}
```
Let me define as arrays of strings of '0'/'1'.

Squid (8 wide? make all 11 wide for uniform grid? Not necessary; each sprite has own width).

Squid frame1 (11 wide to align? classic squid is 8x8). I'll just use per-sprite width.

SQUID (8x8) f1:
```
00011000
00111100
01111110
11011011
11111111
00100100
01011010
10100101
```
f2: swap last two rows:
```
00011000
00111100
01111110
11011011
11111111
00100100
10100101
01011010
```

CRAB (11x8) f1:
```
00100000100
00010001000
00111111100
01101110110
11111111111
10111111101
10100000101
00011011000
```
f2 (swap last two rows):
```
00100000100
00010001000
00111111100
01101110110
11111111111
10111111101
00011011000
10100000101
```

OCTOPUS (12x8) f1:
```
000011110000
011111111110
111111111111
111001100111
111111111111
001110011100
011001100110
110000000011
```
f2:
```
000011110000
011111111110
111111111111
111001100111
111111111111
001110011100
110011001100  hmm shift legs
001100001100
```
Let's craft f2 legs: row6: `011001100110` → shift outward: `110011001100`? that's 12 chars: 1 1 0 0 1 1 0 0 1 1 0 0 — yes 12. row7: `110000000011` → `011000000110`. Fine.

Sprite scale 3: widths 24/33/36, height 24.

Row layout: rows 5. row0 = squid (30pts), rows1-2 = crab (20), rows3-4 = octopus (10).

cellW: need to fit 11 columns with sprite width up to 36 + gap. cellW=58 → total 638. X start = (900-638)/2 = 131. cellH=40.

Alien group speed: base 26 + (total-remaining)*2.2 px/s... classic speed-up is significant: speed = 26 + 60*(killed/total). Plus when fewer than 12 aliens, faster. Fine.

Now code drawing with glow: ctx.shadowBlur. Might be heavy but ok — only for a few draws.

Star background: generate 120 stars fixed, twinkle with time.

Let me write everything out.

Game over overlay: absolutely positioned div over canvas, hidden normally.

Let me write the file.

Also need pause? Not required.

Key handling: track keys object; movement continuous while held. Space: fire on keydown with cooldown, also allow hold-to-fire at cooldown rate (that's fine and bounded).

Restart key R too.

Now write.

Also fire rate bound: cooldown 0.3s min. Bullet lifetime: 1.5s.

Also cap player bullets max 3 on screen? Not required; cooldown enough. But classic caps. I'll allow cooldown only.

Write the HTML.

For lives icons: I'll render small canvas-free: `<span class="life">` styled with clip-path polygon making a cannon shape.

```css
.life{width:22px;height:14px;background:#6bffce;clip-path:polygon(0 100%,8% 45%,42% 45%,42% 0,58% 0,58% 45%,92% 45%,100% 100%);}
```
Good.

Overlay messages: "GAME OVER", "SECTOR CLEARED — YOU WIN". Button "Restart".

Now code:

```js
const state={
 mode:'play', score:0, lives:3, ...
};
```

Let me write carefully, then test in browser.

Full JS outline:

```js
(function(){
const canvas=document.getElementById('game');
const ctx=canvas.getContext('2d');
const W=900,H=640;

const KEYS={};
window.addEventListener('keydown',e=>{
 if(['ArrowLeft','ArrowRight','ArrowUp','Space',' '].includes(e.key)) e.preventDefault();
 KEYS[e.code]=true;
 if(e.code==='Space') tryFire();
 if(e.code==='KeyR') restart();
});
window.addEventListener('keyup',e=>KEYS[e.code]=false);
```

But fire also from held keys in update: if KEYS['Space'] tryFire() each frame — cooldown handles it. I'll do it in update only (avoids double). Keep keydown handler for preventDefault and R.

Sprites + alien defs.

reset():
```js
function reset(){
 score=0;lives=3;mode='play';
 player={x:W/2,w:44,h:26,cooldown:0,invuln:0};
 bullets=[]; eBullets=[]; aliens=[]; explosions=[]; popups=[];
 dir=1; formationX=START_X; formationY=START_Y;
 build aliens
 build bunkers
 fireTimer=1.2; shake=0;
 overlay hidden
}
```

Alien object: {c,r,type,pts,alive:true,x,y computed from formation}.

updateAliens(dt):
- compute alive list; if none → win.
- speed & movement: dx = dir*speed*dt; check bounds using min/max alive alien x+width.
- bounce: if dir>0 && maxX+dx >= W-12 → descend, dir=-1 etc.
- formationY += descend when bouncing.
- invasion check.

Animation: alienAnimT += dt; frame = Math.floor(alienAnimT*  (2 + 6*(1-alive/total)) )%2. Classic speeds up as they die. Also classic "march" beat: play sound — no audio required (could add WebAudio beeps... optional, no network; allowed. Skip audio to save time? A little WebAudio blip adds polish. Maybe skip — focus on requirements.)

I'll add simple WebAudio beeps — it's cheap and offline. Risk: autoplay policy requires user gesture; game starts on load... audio context suspended until first key/click. I'll init on first input. Keep it small, wrapped in try/catch. Actually to keep time budget, include minimal audio: shoot (square down), hit, alien march beat, player death. It's ~25 lines. I'll include it but ensure no errors if unavailable.

Hmm, risk of bugs. I'll include carefully.

Alien shooting: fireTimer -= dt; if <=0 → spawn from bottom-most alive alien of random column; reset timer.

Collision:
- player bullet: for each bullet: bunker hit (loop bunkers, cells), alien hit.
- alien bullet: bunker hit, player hit.

Score feedback: popups "+30" floating up and fading.

Draw order: stars, zone line, bunkers, aliens, player, bullets, explosions, popups.

HUD in DOM: score, high?, lives, controls.

Let me write the final code.

For bunker cell check with bullet rect: 

```js
function hitBunker(b, bullet){
 if(bullet.x+bullet.w<b.x||bullet.x>b.x+b.cols*b.cell||...) return false;
 // check cells overlapping bullet rect
 const c0=..., etc.
 for cells: if solid → point = bullet center; damage; return true;
}
```

damage(b, px, py, R): loop all cells, dist in pixels from cell center to (px,py) <= R*cell → clear. Also erode 1 cell in direction of bullet travel: pass dxSign,dySign and clear cell at offset. Simplify: R = 1.6*cell (6.4px?) cell=4 → R=6.4px, that clears ~ a few cells. cell 4px is quite small; bunker 56x40 total. A bullet is 3x12. Hmm, maybe cell=5 → bunker 70x50. 3 bunkers width 70 each, spacing: x=120, 415, 710? W=900: centers at 175, 450, 725 → x = 140, 415, 690. ok.

R for player = 8px, alien = 10px. Clear cells whose center within R. With cell 5, that's radius ~1.6 cells → clears about 8-12 cells. Visible damage. Good.

Bunker cols=14, rows=10 → 70x50.

Damage persistence: data array persists across resets? Restart restores bunkers (rebuild full). Within game, persists.

Directional erosion: pass dirY = -1 for player (up) → also clear cells at py - R - cell*0.8. I'll add: clear cells within R, plus within R of (px, py + dirY*(R+cell)). Gives tunneling feel. Fine.

Now player rect: x is center. w=46,h=26, y=H-44-? Let's say player.y = H-40-26 = 574? Ground line at H-30=610. Let player.y = 576, h=28, bottom=604, ground 610. Player zone line y = 530. Bunkers y = 470 (470..520). Hmm zone line 530 is below bunker bottom 520 — good; aliens reaching 530 = game over.

Wait, bunkers between cannon (576) and aliens ✓.

Alien start y = 70. Rows cellH=40 → 5 rows → 70..270. To reach 530 they need (530-70-24)/26 ≈ 15 descents... speed rises a lot. Might take long but that's ok; typically aliens shoot player first. Fine. Maybe make descend 30px so fewer descents needed: (530-94)/30 ≈ 14. Eh. Fine either way.

Actually to make game over reachable in reasonable time, invasion line could be bunkers top (470). Classic: aliens reaching your row = lose. Let's set invasionY = 470 (bunker line) and draw dashed line labeled "INVADERS Win Here" at y=466. Then distance from 70+... alien bottom row initial = 70+4*40+24=254; need 470 → 216px / 30 = 8 descents. Reasonable. And it's "player zone"? The requirement: "Aliens reaching the player zone ... causes Game Over". I'll label the line "PLAYER ZONE" — hmm the player zone should be near the player. Let's just say the dashed line marks the danger line; aliens crossing it = game over. Label "DEFENSE LINE — ALIENS CROSS = GAME OVER". Acceptable as player zone? Slightly off.

Better: define playerZoneY = 540 (between bunkers and cannon) and label "PLAYER ZONE". Aliens must descend past bunkers to reach 540. From 254 → 540 = 286px, descend 30 → 10 bounces. With speed increasing that's fine and gives a real game arc. Also aliens will likely reach there as they march. I'll go with playerZoneY=545, descend 30, speed formula making late game fast: speed = 30 + 90*(killed/total) + (alive<12? 30:0). Hmm 120px/s late. Plus bounce descends.

Bunkers y: 460..510. Zone line 545. Player y 576. OK.

Actually if aliens reach 545 they'd overlap the player visually? No, game over triggers first.

Draw zone line as dashed red line across at y=545 with small label.

Now write.

Explosion particles: for alien death: 12 particles random dir, life .5, color alien color. Player death: bigger.

Player death sequence: on hit, set invuln, explosion at player, shake, maybe brief "player respawn" — keep simple: player blinks during invuln.

Screen shake: translate ctx by random offsets when shake>0.

Let's write the code file now.

Also HUD "wave" indicator? Not needed.

Write it.

One more: "Bound projectile lifetime" — maxAge for each bullet type; also they leave canvas → removed.

Test plan after writing: load in browser, screenshot, check console, simulate keydowns via browser tool (key action), check score/bunker damage... The browser tool supports key actions. I'll do: press ArrowLeft several times, Space, screenshot, inspect state via `inspect` (DOM/JS eval? "inspect" action — probably returns DOM/console). I'll try.

To help verification, expose window.__game = {get state...}. I'll expose a debug object: window.__gi = () => ({score, lives, aliens: aliveCount, bunkerCells, playerX, ...}). That lets me verify via inspect (if it evaluates JS). Let's see what "inspect" does — likely returns DOM snapshot and console messages. Maybe I can inject JS by writing a debug readout into the DOM (hidden div updated each frame with state). Then screenshot/inspect reads it. I'll add a small debug line in HUD showing alien count and player x — that's actually reasonable UI (or hidden). I'll put it in a `#debug` element with font-size small, or make it visible as part of HUD: "ALIENS: 55 | X: 450". Slightly gamey but fine and helps verification. I'll include it subtly.

Now write the file.

Let me draft the whole HTML.

CSS: dark space theme, centered layout, canvas with border glow, HUD row.

Code:

```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>SPACE INVADERS — Canvas</title>
<style>
*{box-sizing:border-box}
html,body{margin:0;height:100%;}
body{background:#05060a radial-gradient(ellipse at 50% 0%,#0d1226 0%,#05060a 60%);color:#cfe;font-family:"Courier New",monospace;display:flex;align-items:center;justify-content:center;min-height:100%;}
#app{width:min(96vw,940px);}
h1{...letter-spacing}
#hud{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;font-size:14px;}
...
</style>
```

Careful: body background radial — fine.

Let me write final code in one go.

Game loop:

```js
let last=performance.now();
function frame(now){ let dt=(now-last)/1000; last=now; if(dt>0.05)dt=0.05; update(dt); render(now/1000); requestAnimationFrame(frame);}
```

update(dt) only when mode==='play' (still update explosions/popups when gameover for polish).

Alright, writing.

Alien march animation frame toggling on beat: 

```js
animT+=dt*speedFactor; // speedFactor = 2 + 10*(1-alive/total)
frame = Math.floor(animT)%2;
```

Now bunkers build:

```js
function makeBunker(x,y){
 const cols=14,rows=10,cell=5;
 const data=new Uint8Array(cols*rows);
 for(r...){for(c...){
   let on=true;
   if(r===0&&(c<3||c>10))on=false;
   if(r===1&&(c<1||c>12))on=false;
   if(r>=7&&c>=4&&c<=9)on=false; // arch
   if(r===6&&c>=5&&c<=8)on=false;
   data[r*cols+c]=on?1:0;
 }}
 return{x,y,cols,rows,cell,data};
}
```

Wait arch: rows 7,8,9 removed for c 4..9, row 6 for 5..8. Bottom row full at edges → legs. Good.

Bunker x positions: width=70. centers 165, 450, 735 → x = 130, 415, 700. y=460.

Bullet vs bunker: iterate 3 bunkers × 140 cells = 420 checks per bullet per frame — cheap.

Player shot vs alien: iterate ~55 aliens.

Render bunker with slight per-cell color variation based on index for texture.

Now scoring: squid 30, crab 20, octopus 10. Popup text.

Score display padded 5 digits.

Let's write it.

Alien bullet spawn: choose column among columns that have alive aliens; among them pick bottom-most (largest r alive). Spawn at alien center bottom. vx = clamp((playerCenter - x)/  distance...): aiming: let dx=playerX - ax; vx = clamp(dx*0.6, -60, 60)? Bullet travel time = (by - playerY)/speed. Simple: vx = clamp((px-ax)/2, -70,70). Add slight randomness.

Enemy bullets: speed 250 + random 60.

OK writing now. Also player fire sound etc.

Audio module:

```js
let actx=null;
function initAudio(){ if(!actx){ try{actx=new (window.AudioContext||window.webkitAudioContext)();}catch(e){} } if(actx&&actx.state==='suspended')actx.resume(); }
function beep(freq,dur,type,vol,slide){ if(!actx)return; try{...}catch(e){} }
```

Call initAudio on first keydown/pointerdown.

Keep it short.

Now final code. Also add "Restart" button handler.

Overlay: div with message, button; shown when mode is 'over' or 'win'.

Win: when no alive aliens → mode='win', overlay "SECTOR CLEARED".

Let me write.

I'll write file with `write` tool.

Debug element: `<span id="dbg"></span>` updated in update() every frame? Cheap.

Now compose code fully.

render():
```js
function render(t){
 ctx.save();
 ctx.clearRect...
 // shake
 if(shake>0){ctx.translate(rand*shake, rand*shake);}
 drawStars(t);
 drawZone();
 bunkers.forEach(drawBunker);
 aliens...
 player (blink if invuln: Math.floor(invuln*12)%2===0 → skip draw)
 bullets
 explosions
 popups
 ctx.restore();
}
```

Invuln blink: draw only when (invuln>0 && Math.floor(time*10)%2) — ensure visible at least half.

Let me write everything now, carefully checking variable names.

Also handle resize: canvas fixed size, CSS scales: `canvas{width:100%;height:auto;display:block;image-rendering:pixelated?}` — pixelated could blur text; we draw only shapes. Fine, keep default.

Space key also triggers scroll — preventDefault on Space/Arrows in keydown. Good.

Write.

Empty. Write index.html.

Now run it in the browser. The browser tool loads index.html presumably. Let's inspect.

Looks good. But note: the score says "SCORE" label missing? It shows "SCORE 00000" fine.

Now test: movement, firing, alien motion, bunker damage, restart. Use `inspect` to read window.__game.state() — does inspect evaluate JS? Let's try inspect after actions.

Also note bunkers are between cannon and aliens ✓. Player zone line at 545 ✓.

Let's press ArrowRight for a while, then check state.

Interesting: cannon moved only from 450 → 461 (one key press sends keydown+keyup quickly, small movement — that's fine).

I see an enemy bullet near (460,580)?? and the middle bunker has visible damage: a notch in the top right and a hole in the arch. Wait — middle bunker appears damaged: right column partly removed and a piece separated. Actually looking closer, middle bunker shows a chunk missing at the top-right and a vertical strip separate. That's enemy bullet damage from above. Good — bunker damage visible.

Hmm, but wait: is it possible the enemy bullet destroyed... yes, damage from top.

Let's now test more systematically with a longer hold of Right to test boundary clamp, and Space firing. The key tool sends one press. Better: use `hold`? Not available. I can use browser `key` repeatedly, or drive via JS through... does `inspect` allow running JS? Let's try calling `window.__game.state()` — inspect likely just returns DOM. Let's check by trying an action: maybe "type" writes into focused element.

Alternative: simulate holding keys by dispatching keydown events repeatedly via `key` action — but keydown+keyup pairs. Since movement is per-frame while key held, a single press gives tiny movement. To test boundary, I can press ArrowRight many times (each gives ~some px). Or rely on window.__game.press via... I need a JS eval channel.

Maybe `inspect` returns DOM — I could put state into DOM (I already do: ALIENS 55 | CANNON 450). So DOM readouts give me score/lives/aliens/bunker? I have score, lives icons count, aliens, cannon x. Bunker cells not shown. I could add bunker cells count to the debug readout. Let's add "BUNKER" cells to the dbg element for verification. That's fine (subtle debug line already exists).

Also for testing boundaries, repeated key presses work: each press maybe moves ~10-30px depending on duration. Let's press ArrowRight ~20 times and see if x clamps at max 866.

Actually better: does the harness support holding? Actions: key (single). I'll do repeated presses.

Let's first add bunker cells to dbg text via edit, then reload.

Also potential issue: with `keys.Space` held from keydown — space press via tool gives keydown+keyup quickly, but tryFire also triggers on keydown? No — I only fire from update() when keys.Space held, and keyup clears. If the press happens between frames, no shot may fire at all! Actually keydown → keys.Space=true; then next animation frame (within 16ms) update sees Space → fire; then keyup sets false. Key press duration by tool is likely a few ms to tens of ms; risk: keyup arrives before next frame → no shot. That's a real usability bug for quick taps (human taps last >16ms usually, but still risky).

Fix: fire on keydown too (edge-triggered), guarded by cooldown. Then holding fires at cooldown rate from update. Let's add `if (e.code==='Space') tryFire();` in keydown.

Also the earlier screenshot showed an enemy bullet but I haven't fired yet. Let's make the keydown change plus dbg bunker cells.

Another consideration: alien bullets colliding with player — inv starts at 1.0 after restart (protection at start). Fine.

Let's edit.

tryFire is defined later with `function tryFire()` — function declaration is hoisted within IIFE scope, so fine.

Reload and test: fire at middle column alien; but bullets from x=450 go up through the middle bunker (415-485) → will hit bunker first. To hit an alien directly and gain score, move to a position where no bunker is above (e.g. gap between bunkers: bunkers at 130-200, 415-485, 700-770; gaps at 200-415). Player at 450 initially under middle bunker.

Test sequence:
1. Reload.
2. Press ArrowRight several times to move into gap ~x=300? Each press moves ~10-60px. Let's check positions after each press via DOM.

Alternatively, to test score, fire at bunker first (verify bunker cell count drops), then move to gap and fire to hit alien (score increases).

Let's reload first.

An error occurred: aliens and player are not rendered. "Cannot read properties of undefined (reading 'length')". Where? Probably in drawSprite: TYPES[t].spr[frame] — frame might be 1... no. Or TYPES[t].spr is defined. Hmm.

Actually the error likely occurs in update/render after my edit? The edit didn't touch rendering. Wait, previously it worked. What changed? `bunkerCells(bunkers[m])` inside updateHUD — updateHUD is called from restart() at startup, where bunkers is defined... but initial `restart()` order: mode..., buildAliens(); buildBunkers(); ... updateHUD(). bunkers defined. Hmm but HUD shows "BUNKER 330" so it worked.

Wait — error "reading 'length'" and aliens/player not drawn. Maybe error in drawSprite with TYPES[t].spr[frame] where frame... Let's think: marchFrame = Math.floor(marchT)%2 → 0 or 1. spr has 2 frames. OK.

Where else `.length`? `rows[0].length` in spriteSize — TYPES[t].spr[0] could be undefined if t... no.

Others: `bullets.length`, `aliens.length`, `bunkers.length`, `eBullets.length`, `stars.length`, `ex.parts.length`, `popups.length`, `keys[...]`... 

Hmm: In updateHUD I added loop using `var m` — no conflict.

Maybe the error happened at script evaluation: `window.addEventListener` ... no.

Actually wait: the render shows bunkers but no aliens/player/stars twinkle yes. So the error is thrown before drawing aliens and player but after drawing bunkers? Order in render: stars, ground, zone, bunkers, aliens, player... So error at aliens drawing: `TYPES[a.type].color` fine, `drawSprite(a.type, marchFrame, ...)` → `TYPES[t].spr[frame]` undefined → `rows.length` → error "Cannot read properties of undefined (reading 'length')" ✓. So spr[frame] undefined → frame not 0/1 or spr undefined.

marchFrame: `Math.floor(marchT) % 2`. marchT increases... fine unless NaN. NaN % 2 = NaN → spr[NaN] undefined ✓. marchT becomes NaN if dt is NaN: dt = (now-last)/1000 — first frame `last = performance.now()` set before restart(); restart calls beep... no.

Hmm but this worked before the edit! What did I change that could produce NaN? Nothing in update. Unless... `elDbg.textContent` loop `bunkerCells` — no.

Wait, maybe error occurred on the *first* frame only in this run due to timing race — e.g., `performance.now()` vs rAF timestamp origin differences? Actually `performance.now()` and rAF timestamp share the same time origin, but rAF's `now` can be *earlier* than performance.now() called right after a previous frame? If now < last, dt is negative → not NaN, but alien step negative... marchT would decrease, possibly negative → Math.floor(negative)%2 = -1 → spr[-1] undefined → ERROR! 

Yes! rAF timestamps are the vsync time, which may be slightly before performance.now() called at script end. dt negative → marchT negative → marchFrame = -1 → crash. Also `dt > 0.05` clamp doesn't catch negative.

But why did it only appear now? Randomness/luck — likely it happened before too sometimes.

Fix: clamp dt to [0, 0.05]: `if (dt < 0) dt = 0; if (dt > 0.05) dt = 0.05;` and guard marchFrame: `Math.abs(Math.floor(marchT) % 2)` or use ((n%2)+2)%2.

Also mode check: render happens even if update crashed? The whole frame throws so render never runs — but screenshot showed bunkers/stars, meaning render ran. Hmm, so error was thrown in update? If update throws, render doesn't run. Unless error thrown inside render after bunkers drawn (aliens loop) — but stars drawn, bunkers drawn → yes it's render. But then how did marchFrame get invalid if update ran fine? update runs before render; if update threw we'd see nothing. So update ran with marchFrame = -1 or NaN (no error there since it's just a number), then render crashed at drawSprite. Consistent.

Actually wait: could marchT be NaN? Math.floor(NaN)=NaN, NaN%2=NaN, spr[NaN] undefined. dt NaN only if now/last NaN — unlikely. Negative dt → marchT negative → Math.floor(-0.001) = -1 → -1%2 = -1 → spr[-1] undefined. Most likely.

Fix both: clamp dt to >= 0 and guard marchFrame.

Also to be extra safe, drawSprite falls back to frame 0.

Let's patch.

Wait: if dt=0 on first frame, then marchT stays 0 → frame 0, fine.

But there's a subtlety: marchT only increases in update while mode==='play'. Fine.

Reload and check console.

No console errors. Initial formation: 55 aliens, 3 bunkers, 3 lives, score 0, cannon 450. 

Now test firing at bunker: cannon at 450 is directly under the middle bunker (415-485). Press Space and check BUNKER count drops from 330.

Note BUNKER 330 — that's 3 bunkers × 110 cells each? Full bunker: let's compute: rows... anyway 330 total.

Fire a couple times.

Wait — the space press produced a shot, but interestingly BUNKER dropped from 330 → 268 (62 cells destroyed!) That's a lot from one shot. Hmm, actually 62 cells... damage radius 8px with cell 5 → cells with |mx-cx|<=8 and |my-cy|<=8 → 3x3ish cells ≈ 9-15 cells per pass, ×2 passes = ~20-30. 62 seems high. Maybe multiple bullets? The screenshot shows an enemy bullet in flight (the yellow dot at 443,517) — that's an alien shot. The bunker damage visible: middle bunker has a big hole top-left, right bunker has a big chunk removed top-left... Hmm right bunker damage wasn't from my shot.

Wait, why did right bunker lose a chunk? Also earlier screenshot after one ArrowRight press showed middle bunker damaged — that was from alien fire.

Hmm, actually looking at the current screenshot: middle bunker damaged at top-left, right bunker damaged top-left. Those look like *alien* shots (falling from above). Alien bullets fall from aliens; they hit bunker top → damage radius 10 → ~50-60 cells with two passes (radius 10 → 5x5-ish = 25 cells per pass, 2 passes offset → up to ~45). So 62 total across bunkers plausible.

But wait: my shot from x=450 going up into middle bunker (415-485, so 450 is 70px... within). Should also have damaged it. Middle bunker top-left hole around x≈570 screen (canvas offset ~125) → canvas x ≈ 445 ✓ — that's my shot hitting the top? No, my shot from below would hit the bottom of the bunker... but the arch bottom middle is empty (c 4..9 removed), so the shot travels up through the arch and exits at row 6/5 (c 5-8 removed at row 6, solid at row 5) → hits row 5-6 from *below* inside the arch. Damage radius 8 centered inside → clears a chunk. The visible hole in the middle bunker is at the top-left of the arch region... 

Hmm the hole appears at the bunker's upper-left, which for a shot traveling up at x=445 (bunker x=415, so local x=30 → cell 6, in the arch) → damage around cell (6, ~5). That would appear as a hole at the left-middle/upper area. Plausible ✓.

So bunker damage from player shot verified: 330→268 total (but some of that could also be alien fire concurrently).

Actually — potential concern: two passes each clearing up to ~30 cells makes a big hole (62 cells out of 110 in a bunker = over half a bunker from one shot!). That's too destructive. Let me reduce: player radius 8 with square test (|dx|<=8 and |dy|<=8 = 16x16px area = 3x3 cells(5px) = 9 cells per pass, 2 passes = 18 max). Alien radius 10 → 5x5-ish: |dx|<=10 → 5 cells wide... cells centers at 5px spacing → ~5 cells each direction → 25 cells per pass, 2 passes → up to 50.

Hmm, player 62 lost in one shot doesn't fit 18 max... unless multiple hits. Let's not over-analyze; but maybe multiple of my shots? Only one Space press → 1 shot (cooldown aside).

Also note: 330 initial = 110 per bunker. Let me compute full bunker cell count: rows 0..9 × cols 0..13 with exclusions. Row0: keep c 3..10 = 8. Row1: keep 1..12 = 12. Rows 2-5: 14 each = 56. Row6: 14 - 4 (c5..8) = 10. Rows 7-9: 14 - 6 = 8 each = 24. Total = 8+12+56+10+24 = 110 ✓ → 330 total.

So 62 cells gone = a lot. Two alien hits (radius 10, up to 50 each but overlapping) plus my shot. In the screenshot, right bunker has a big top-left hole (~30 cells), middle has ~30 cells. So my shot might have done little and two alien shots did the damage? But alien shots only started... there's one in flight at (443,517) — canvas coords? screen 443 minus canvas left ~125 → 318. Hmm, the bullet at screen (443,517) → canvas x ≈ 318, y ≈ 517-93 = 424? Actually canvas top in screenshot ≈ 88, so canvas y ≈ 429. So an alien bullet at canvas (318, 429) — falling toward left bunker region... left bunker undamaged.

Whatever. Key question: is damage too big? Let's evaluate: the holes look reasonable/visible in the screenshot — "visible damage" ✓. Bunker erosion feels a bit fast but acceptable for gameplay (classic invaders erode bunkers fairly quickly too).

Actually, wait: is it possible my single player shot destroyed 62 cells? Two passes with radius 8: pass 0 clears cells with centers within 8px square of bullet center (at bunker x=450 → local 35 → cells c 6,7,8 have centers 32.5, 37.5, 42.5 → |dx|<=8 → c 6,7,8 (centers 32.5,37.5,42.5 vs 35 → 2.5, 2.5, 7.5 ✓)). Rows near impact: shot travels up through arch; impact when overlapping solid cell — say at row 5 (y = 460+27.5=487.5). bullet y range... cy = bullet center. rows with |my-cy|<=8 → 3 rows. So 9 cells pass 0. Pass 1: cy - (8+5) = cy-13 → 3 more rows × 3 = 9. Total 18 max. Not 62.

So the big damage came from alien shots (radius 10 → 5×5=25 per pass, 2 passes = up to 50 but overlapping → maybe 30-40 each). Two alien shots = 62 plausible.

Hmm, but alien shots started ~1 second ago (fireTimer=1.4 initial). And right bunker's big hole. OK.

I think alien damage radius 10 (2 passes → up to ~40 cells = 36% of bunker per hit) is too destructive; typical invaders removes a small chunk. Let's reduce: pass 1 (directional) should only clear cells that are actually *in front* and within a smaller radius, or just reduce radii: player 7, alien 8, and make directional pass radius 6. Let's tune: keep two passes but second pass radius = radius*0.6.

I'll modify damageBunker to accept radius and use pass-1 radius = radius*0.65.

Actually simpler: change radii: player 7 → pass0 ~3x3=9, pass1 offset (7+5)=12 with radius 4.5 → ~2-3 cells ×1-2 = ~5. Total ~14. Alien: radius 8 → 3-4 cells wide ×3-4 tall ≈ 12-16; pass1 offset 13, radius 5 → ~4-6. Total ~20 (18% of bunker). Reasonable.

Let's do that: `var rad = dirY < 0 ? 8 : 9;` and in damageBunker second pass use radius*0.6.

Now next: test scoring — need to hit an alien. Move player to a gap (x between 200 and 415, e.g. ~300) then fire. Let's press ArrowLeft a few times to reach ~300.

Let's also verify score increments and alien count drops to 54.

Do the edit first? Edits then reload resets state — fine.

Let's do the tuning edit, reload, then move & fire.

Note: `var rad` in bunkerCollision (outer) and `var rad` in damageBunker (separate function) — no conflict. But inside bunkerCollision I declared `var rad` — and in damageBunker another `var rad`. Fine.

Now reload and test moving to a gap and firing at an alien.

Player starts at 450 under middle bunker. Gap between bunker1 (130-200) and bunker2 (415-485): x in ~205-410. Move left to ~300: need -150px. Each ArrowLeft press = ? Earlier one ArrowRight press moved 11px?? "CANNON 450 → 461". Hmm only 11px. That means keydown+keyup spanned ~35ms or the key was held briefly. So I'd need ~14 presses. Tedious but fine. Actually maybe the tool holds for a short duration.

Alternative: fire from 450 upward — the shot goes through the arch. Wait! The arch's bottom middle is open (c4..9 rows 7-9 removed, row6 c5-8 removed), so a shot from x=450 (local 35 → c6-8) travels up through the arch opening and hits row 5 (solid) → bunker stops it. So can't pass.

So I need to move. Let's press ArrowLeft multiple times. I'll do several key actions. Or... I can use `window.__game.press('ArrowLeft', true)` — but I have no JS eval channel.

Hmm — maybe browser `type` action types into focused element; not helpful.

I could add a hidden feature? No. Just press keys repeatedly.

Let's reload first, then press ArrowLeft ~15 times, then Space, then check DOM.

Each tool call is one action; I can't batch multiple browser actions in one block? The instructions say independent calls can be batched — but browser actions are sequential and order matters; I can still issue multiple browser calls in one block? They'd run in parallel/undefined order — risky for key presses. I'll do them sequentially but that's many round trips.

Alternative approach: press key with `key` action — maybe it auto-repeats if I use text "ArrowLeft"? Let's just do a few calls and observe x each time.

Actually, better idea: since score check just needs an alien hit, I could also test by moving right into the gap between bunker2 and bunker3 (490-695): press ArrowRight ~10 times to reach ~600 (gap). Each press ~11px → need 150px → 14 presses. Same.

Hmm, what about firing *through* the hole I already blasted? Reload clears.

Alternative: The player shot destroys bunker and continues? No — it's consumed (bullets.splice on bunker hit). Classic behavior: shot is absorbed. Fine.

OK, let's just do repeated presses. To reduce round trips, maybe the `key` action supports holding? Not documented. Let's try pressing ArrowLeft and see delta; if ~11px per press I'll need many.

Alternatively I can verify alien-kill scoring differently: alien bullets hitting... no, score only from player shots.

Hmm — another option: temporarily test via a page-level script injection? The `type` action types text into... maybe into the page (focused element). If I focus an input... there's no input.

Trick: I could add a hidden `<textarea id=evalbox>`? Too hacky.

Actually — I could make the debug HUD include a "TEST" hook? No.

Simplest: rely on many key presses. Let's estimate: maybe the key action holds longer than I think (11px suggests ~35ms hold at 320px/s). Ugh.

Better: temporarily lower... no.

Alternative: I can verify kill/score with the cannon right under a gap *initially*? No, restart puts it at center under a bunker.

Hmm wait — actually, is the center really under the bunker? Middle bunker spans 415-485, center 450 → yes.

OK: Let's think about how many presses: need player x ≈ 300 (gap 205-410). Δ = 150px. If 11px/press → 14 presses. Each press is one tool call round trip (fast, ~1s each?). That's acceptable-ish (~15 calls). Alternatively aim for x ≈ 400 (still gap, Δ=50 → 5 presses) — but shot at x=400 must clear bunker2 (415-485): shot width 3 at 400 → spans 398.5-401.5, and bunker2 starts at 415 → passes ✓. And does x=400 have an alien above? Alien columns: formation starts formX=131 (initial, moves), cols at 131 + c*58 + offsets. Column positions (initial): c=0: 131+0+(58-36)/2=142 for octo... alien centers vary by type. Column c spans x = 131+c*58 .. +58. For x=400: (400-131)/58 = 4.6 → column 4 spans 363-421 ✓. So a shot at x=400 will pass through column 4 gap? It will hit whatever alien is in the column at that x — the alien sprite is 36 wide within 58 cell, centered → 374-410 for octo; x=400 is within ✓ (bottom rows are octopus, 36px wide, centered: cell4 center = 131+4*58+29 = 392; sprite spans 374-410; 400 inside ✓).

But aliens are moving horizontally. By the time I fire, formation may have shifted. Formation starts moving right at 30px/s from x=131... after a few seconds it's shifted maybe 60-100px. Then column positions shift too. I'll just fire and check; if miss, fire again.

Also the shot must not hit bunker: x=400 is in gap 205-415 ✓ but if formation moved, aliens above move too; doesn't matter, shot travels up and hits the lowest alien in the column if aligned.

So: press ArrowLeft ~5 times (150→ wait, moving LEFT from 450 to 400 = 50px → ~5 presses).

Let's do it: reload, then 5 ArrowLeft presses checking DOM, then Space, check score.

Actually pressing left 5 times gives 450→395. Good.

But careful: score only increments if alien hit. Alien count 55→54 and score +10 (octopus bottom row).

Let's go. Reload first.

Player cannon is invisible in this screenshot — because inv=1.0 at restart and blink logic hid it at that instant (screenshot taken during blink off-phase). Fine, but let's check it appears. It's blinking; screenshot happened at off phase. Acceptable (invulnerability blink), but initial inv=1.0 makes the cannon flicker at start — slightly odd. I'll reduce initial inv to 0.6 or just leave blink. Minor.

Now move left ~5 presses.

Cannon visible at 439, moved left ✓. Alien formation moving right. Bunker 318 (alien shot hit middle bunker, modest damage now ~12 cells ✓ better).

There's an alien bullet at screen (433,409) heading down toward the player, and player bullet... wait, there's a small yellow mark at (484, 727) just below/left of the cannon — that looks like an alien bullet near the player. Hmm.

Wait, actually the yellow thing at (433,409) is an alien shot falling. And at (484,727) — canvas coords (359, 639) — near ground below player? That might be an enemy bolt that got close to the player.

Player at 439 screen... cannon screen x ≈ 588 → canvas x = 588-125 = 463? Hmm, the DOM says CANNON 439, canvas center screen = 125+450=575. The cannon appears at ~588 → canvas ~463. Slight discrepancy — maybe the screenshot was taken mid-move (between keydown and DOM update? no, DOM updates each frame). Eh, could be my reading of screen coordinates. Not important.

The important thing: press Space now and see if score increases. Player at 439 → under middle bunker (415-485) → shot blocked. Need to move left more (~4 more presses to ~395) — but x=395 shot spans 393-397, bunker2 starts 415 → clear ✓.

Hmm but wait: also must be in a gap relative to *alien column* alignment to hit an alien — any x in the gap will hit whichever alien column it passes through, as long as the sprite pixel overlaps. Let's move left 4 more times then fire.

Actually alternatively: fire now — the shot hits bunker (verifies bunker hit from below). Then move. But we've verified bunker already.

Let's do 4 ArrowLeft presses then Space.

Interesting: the red/pink mark at screen (443,471) — that's an *explosion*? It looks like a pink burst mid-air at canvas x≈318, y≈383. Hmm, that could be a player shot hitting... no, no alien there. Actually it might be an alien bullet (pulsing red/yellow) at canvas (318, 383). Yes — enemy bolt.

Player at 423. Move left 2 more → ~390, then fire.

Let's press ArrowLeft twice more, then Space. Sequential calls.

Player at 413. Bunker cells decreasing (alien fire eroding all three bunkers ✓ visible damage).

Move left a bit more to be clearly in the gap (need x < 415-  shot halfwidth; x=413 already outside bunker2 (starts 415)? shot spans 411.5-414.5 < 415 ✓ just barely). Safer: 2 more presses → ~390.

Then fire.

Let's press ArrowLeft, ArrowLeft, then Space. To save round trips, I'll fire now at 413? Risky (shot might clip bunker2 edge — no, 414.5 < 415). Alien formation has moved right by ~... formation started at 131 and moved right; columns now at approx: looking at screenshot, aliens span screen 340-1000 → canvas 215-875. Hmm, formation right edge at canvas ~875 which is near the bounce limit (W-10=890). It'll bounce soon.

Column positions: with formX ≈ ? Alien leftmost (col0) at canvas ~215 (screen 340). So col c center ≈ 215 + c*58 + 29. For x=413: (413-215)/58 = 3.4 → col 3 spans 389-447, center 418; octopus sprite 36 wide → 400-436. x=413 is within ✓.

Fire now.

A white player shot is visible at screen (557,557) heading up, in the gap between bunkers ✓ (it passed through the gap). Bunker dropped 290→248 — hmm, that's 42 cells lost, and the left bunker now shows a big hole with a particle explosion. But my shot is in the gap... so that damage is from alien shots. Alien shots doing 42 cells between frames? Two alien hits ~20 each ✓ consistent with new radii.

Hmm wait, actually BUNKER went 306→290 (-16) then 290→248 (-42) in ~1 second. Alien fire rate could easily land 2 hits. OK.

There's also an enemy bolt at (653, 640) near player.

The white player shot will reach aliens shortly. Let's check score now — the DOM above was captured at same moment. Let's press Space again? No, first check current state: take a screenshot/inspect to read score.

Wait — but there's a concern: the player shot appears to be at screen x=557 → canvas ~432? Player at 413, shot spawns at player.x -1.5 = 411.5 → screen 536. Screenshot shows ~557. Eh, whatever (my screen mapping may be off; canvas left edge ~125, so 411.5+125=536 vs observed 557 — 20px off, could be my eyeballing).

Anyway, let's inspect to see score.

Two important observations:

1. **Lives dropped to 2** and cannon reset to 450 (playerHit resets x to center) — enemy shot hit the player ✓ (lives 3→2, respawn centered, invulnerability). Verified.

2. **Score still 00000, ALIENS 55** — my shot missed the aliens. Why? The shot was in the gap at x≈411 while formation... The formation had bounced and the aliens are now at screen 275-930 → canvas 150-805. Column 3 center ≈ 150+3*58+29 = 353. My shot at 411 → column (411-150)/58 = 4.5 → col 4 spans 382-440, center 411, octopus sprite centered → 393-429. Shot at 411-414 should hit col4's octopus... unless formation moved *during* the shot's ~0.5s flight. Formation moves at ~30px/s → 15px in 0.5s; sprite is 36 wide, shot 3 wide, gap between sprites in same row = 58-36 = 22px. A 15px drift could shift sprite alignment but the shot only needs to overlap the sprite at any moment as it passes through rows... it passes through row4 (bottom) first, at some y. If the sprite moved such that x-gap aligned → miss possible but 15/22 chance of miss... plausible.

Also possible: the shot was consumed by... no, bunker was already passed.

Actually another possibility: the player's shot at x≈411 while formation had col 4 sprite at 393-429 → overlap ✓ hit expected. Unless my screen→canvas mapping is wrong (I estimated canvas left = 125; the canvas is 900 wide displayed at ~950? The app width = min(96vw, 950px) = ~1152*0.96=1105 → capped 950. So canvas displayed width = 950-ish minus borders → scale ~1.05. So screen x → canvas x: (screen - leftEdge)/1.05. Left edge ≈ 125. So screen 557 → canvas (557-125)/1.05 = 411 ✓ matches my shot spawn at 411 (screen should be 125+411*1.05=557 ✓ good).

Player: DOM says 413 → screen 125+434 = 559, and cannon drawn at screen ~560 ✓ consistent.

So the shot went up at canvas x≈411-414. Aliens: canvas leftmost alien screen 277 → canvas (277-125)/1.05 = 145; rightmost screen 925 → canvas 762. Column 4 = 145+232=377..435, center 406; octopus 36 wide centered → 388-424. Shot 411.5-414.5 ⊂ [388,424] ✓ should have hit!

Unless the formation direction reversed during flight... reversal moves it the other way but position change is small.

Hmm, OR: the shot hit a *cell* of a bunker? Player at 413, shot at 411.5-414.5. Bunker2 spans canvas x 415-485. 414.5 < 415 → passes. But wait — screen scale: shot visibly passed the bunkers (it was above them at y=557 screen... actually the shot at screen y 557 → canvas y (557-90)/1.05 ≈ 445 — that's *above* bunker top (460)? The bunkers at screen y 575-635 → canvas (575-90)/1.05=462 ✓. So shot at canvas y≈445 was just above the bunker top — meaning it already passed through. But did it pass through bunker2's left edge? The gap between bunker1 (130-200) and bunker2 (415-485): shot at 411.5-414.5 → in the gap ✓.

Wait — but maybe it grazed bunker2's very edge cell: cell c = floor((411.5-415)/5) = negative → c0 = max(0,...) = 0. Hmm! Bug: c0 = Math.max(0, ...) but c1 = Math.min(cols-1, floor((x+w-b.x)/cell)). If bul.x < b.x, c0=0 (correct-ish). rectHit passed means overlap: bul.x+w > b.x → 414.5 > 415? No, false → rectHit false → bunker skipped. OK.

So the shot should have hit an alien. Unless... the alien formation's *bottom row* y: formY=64 + oy 4*40=160 → y=224..248 canvas. Shot travels up from y≈566. No issue.

Alternatively the shot *did* hit an alien but score didn't update? killAlien adds score and calls updateHUD ✓. And ALIENS would drop to 54. It shows 55/00000.

Hmm! Maybe the shot was destroyed on the *enemy bullet*? No bullet-bullet collision.

Or maybe... the player fired at a moment when cooldown? First fire at that press: cd was 0 → fired ✓ (we saw the shot).

Maybe the shot was still in flight when I inspected? No — several seconds passed and then player got hit.

Wait, actually — look again: maybe the shot traveled up and the formation at that time was further right/left such that the shot passed through a column *gap* (between sprites). At the moment of passing bottom row (≈0.5s after firing... actually from y=566 to y=248 = 318px at 540px/s = 0.59s), formation moved ~18px. Column spacing gap between sprites = 22px (octopus). Chance of passing exactly through a 22px gap: sprites occupy 36/58 = 62% → 38% chance of miss per row, but there are 5 rows and the shot only needs to hit... no wait, if it passes the bottom row gap, the next row (also octopus, same column alignment) also has a gap at the same x (columns are aligned) → all rows aligned → miss entirely with 38% probability... but shot is at a specific column center 406-411? If shot x is near column center it can't miss.

Column center 406 vs shot 411.5-414.5: within ±18 of center. If formation shifted LEFT by 18+ during flight, sprite spans shift left by 18 → sprite then 370-406 → shot at 411.5 > 406 → miss! Formation was heading... it had bounced (it was at right edge ~875 canvas earlier, bounced → moving left at 30px/s... after bounce speed maybe 30+ px/s. In 0.6s → 18px left. So yes — miss plausible.

So the shot likely just missed due to motion. I need a more reliable scoring test: fire repeatedly while tracking. Or aim at an alien column after observing current formation.

Better: fire several shots in quick succession (each 0.32s apart) — but only via separate tool calls with latency ~1-2s each. Cooldown fine.

Alternatively move player under a column that's currently aligned and fire. Since formation drifts slowly (30px/s) and sprite is 36 wide vs shot 3 wide: if I aim within ±17 of a column center, at shot fire time it hits unless formation moves >~20px during 0.6s flight — 30px/s*0.6 = 18px. So aiming at the column center gives good odds.

Current formation: canvas leftmost ≈145 (col0 left edge). Column c sprite left = 145 + c*58 + (58-w)/2.
For col 3 (octo): 145+174+11 = 330..366, center 348.
So move player to ~348: from 450 → -102px → ~9 presses at 11px each. Ugh.

Alternatively col 4 center 406: from 450 → 4 presses left → 406. Let's do 4 ArrowLeft presses then Space. But the player is now at 450 (respawned center).

Hmm, but each tool round-trip takes time during which formation keeps moving left at 30px/s (and speeds up as aliens die... none died). Actually formation bounces: moves left until left edge < 10 → x=145 → 135px to go → 4.5s then bounces right.

Timing is annoying but let's just try: 4 presses left (≈44px → 406), then Space.

Risk: formation bounced meanwhile. Let's just do it and iterate; score feedback will show.

Also I should double check: is it possible that hits aren't registering due to a bug? Best to verify at least once. Let's aim and fire a few times.

Alternative quicker verification: reduce uncertainty by firing *multiple* shots — each Space press fires one (cooldown 0.32s; tool latency > 0.32s so each press fires).

Plan: press ArrowLeft 4 times (checking DOM each time), then Space, inspect.

Actually a smarter approach: rather than chasing column centers, note that alien *rows* differ in width: top row squids are 24 wide (cell 58 → sprite centered spans center±12), so aiming matters more. The bottom octopuses are 36 wide → most forgiving.

Let's go. Press ArrowLeft.

Wait — GAME OVER already?! Lives showed 2 in previous inspect, now LIVES shows nothing (0 lives). But ALIENS 55 and the aliens are at y ≈ 425-610 screen → canvas y ≈ (425-90)/1.05 = 319 ... bottom row at canvas ~ (610-90)/1.05 = 495 → that's below ZONE_Y=545? 495 < 545. Hmm.

Aliens bottom row appears at screen y ~600 → canvas ~486. Zone at 545 → screen 90+545*1.05 = 662. The dashed line is visible at screen ~665. So aliens haven't crossed the zone.

So game over came from lives reaching 0 (LIVES empty). We had 2 lives, then... enemy shots hit twice quickly? Between my ArrowLeft presses there were a couple of seconds. Invulnerability is 2.2s — two more hits within that window shouldn't be possible... unless inv expired.

Hmm, the previous inspect showed lives=2 (the stat label "LIVES" with no hearts visible in this last screenshot means 0). So we lost 2 lives between those two tool calls (~2s apart?). Possible if inv=2.2 expired and then two hits... unlikely in 2s.

Wait — actually look again at previous inspect screenshot: hearts showed 2 icons. Then one ArrowLeft press later → 0 lives and GAME OVER. That's 2 lives lost in ~1-2 seconds. Suspicious!

Possible bug: playerHit sets inv=2.2 but... after gameOver? Let's re-read playerHit:

```
function playerHit() {
    if (player.inv > 0) return;
    lives--;
    ...
    if (lives <= 0) { gameOver(); return; }
    player.inv = 2.2;
```

Fine. But what about *multiple eBullets* hitting in the same frame? eBullets loop: after playerHit sets inv=2.2, subsequent bullets check `player.inv <= 0` → false. OK.

Unless... `player.inv` decrements: `if (player.inv > 0) player.inv = Math.max(0, player.inv - dt)`. Fine.

Hmm, but what about the case where playerHit is called and lives becomes 0 → gameOver... We went 2 → 0, so two hits.

Unless lives was already lower than displayed... The HUD shows lives icons: previous inspect showed 2 hearts. So lives=2. Then lost 2.

Possibility: dt clamp... no.

Possibility: shots hitting player while inv blinking... no, inv is a timer not blink-based.

Let's think about timing: my tool calls are maybe 3-6 seconds apart (each returns screenshot). So between the inspect (lives=2) and the ArrowLeft press, several seconds passed — enough for inv to expire and 2 more hits. Plausible! Enemy fire rate with 55 aliens: fireTimer = max(0.3, (0.45+rand*0.9)*(0.35+0.75*55/55)) = (0.45..1.35)*1.1 ≈ 0.5-1.5s. So ~1 bullet/sec. Getting hit twice in ~5-6s with a stationary player (at x=450 center, bullets aim at player) is very plausible.

OK so game over by zero lives works ✓. That's actually a required behavior verified.

Also note: aliens at canvas y bottom ~486 — they descended a lot (formY increased by ~7 bounces) ✓ motion/descend works.

Now: Restart test — click RESTART and check formation restored (ALIENS 55, BUNKER 330, LIVES 3, SCORE 0, CANNON 450).

Then test alien-kill scoring.

Let's click the overlay RESTART button at screen (600, 477).

Restart verified: ALIENS 55, BUNKER 330 (fully restored), LIVES 3, SCORE 00000, CANNON 450, formation back at top, bunkers intact, cannon centered.

Now verify scoring on alien hit. Player at 450, under middle bunker. Formation just restarted: leftmost alien canvas x ≈ (277-125)/1.05 ≈ 145. Column 4 center ≈ 145+4*58+29 = 406. Move left from 450 → 406 = 44px → 4 presses (each ~11px). Then fire.

But the formation moves right initially (dir=1) at 30px/s. So while I'm pressing, formation moves right ~+30px/s → column centers increase. By the time I've pressed 4 times (~4-8 seconds?), formation moved +120-240px and might have bounced.

Alternative smarter approach: rather than precise aiming, fire from a gap repeatedly while the formation passes overhead — eventually a shot aligns. But we need a gap first (x between 205-415).

Simplest robust approach: fire shots while tracking column drift. Let's think about time budget: I have maybe 8-9 minutes left. I've used ~6.

Plan: press ArrowLeft 4 times quickly (4 calls) → x≈406, immediately press Space. Formation during those ~4-8s: starts at 145, moving right; if ~5s elapsed → +150 → leftmost 295, col4 center = 295+232+29... wait col4 sprite center = leftmost_col0_edge + 4*58 + 29 = 145+232+29 = 406 at t=0; at +150 → 556. That's way off 406.

Hmm. Instead of chasing, better: aim where aliens *will* be? Or move player right instead — player at 450 needs to reach a gap: gap between bunker2 (415-485) and bunker3 (700-770) is 490-700 → move right ~40px to 490+ → 4 presses right ≈ 494. Meanwhile formation col centers: col5 center = 406+58 = 464, col6 = 522, col7 = 580, col8=638...

At restart, formation at 145 (leftmost). It moves right at 30px/s. Time to reach right edge: right edge = 145+638=783 → needs to reach 890 → 107px → 3.6s, then bounces left.

So after ~4 presses (say 6s), formation has bounced and is moving left: right edge at ... complex.

Honestly the simplest reliable approach: fire *many* shots from a gap position and eventually hit. Each Space press = 1 shot, and I can do several presses. With sprite coverage 62%, each shot through the alien band has ~62% chance of hitting (independent of alignment since formation drifts)... but wait — the whole column set is aligned; if the shot's x falls in a gap between columns, ALL rows have a gap at that x (columns aligned) → miss with probability 38% per shot regardless of drift? No — drift shifts the whole formation, so whether x falls in a gap or on a sprite changes over time. Each shot's outcome depends on formation position at passage time; drift means successive shots see different offsets → each ~62% chance.

So: move to a gap, fire ~4 shots → P(at least one hit) = 1-0.38^4 ≈ 79%. Fire 6 → 96%.

But note shots pass through *bottom* row first (octopus 36 wide = 62% coverage), then if it passes a gap there, rows above are same column width... rows 3,4 octopus (36), rows 1,2 crab (33 wide → 57%), row 0 squid (24 → 41%). Since columns aligned, coverage at a given x is max over... if x misses octopus in rows 3,4, it may still hit crab row (crab is centered too, 33 wide vs 36 — narrower) → so miss overall ≈ 38%.

Good. So: get into a gap and fire several times.

Player at 450 → need x in 490..695 → press ArrowRight 4 times → ~494 (at edge of gap 490 ✓, but must be >485+ shot halfwidth... 493.5 > 485 ✓ ok, but tight). Press 5 times → ~505. 

Alternatively left gap 205-415: from 450 press left 4 times → ~406, which is in gap (406 < 415) ✓ and also near col4 center at t=0 (406!). Since formation moves right, col4 center goes to 406+Δ; if Δ up to ~58+ , shot may fall in gap between col4 and col5 (gap is 22px wide though). Ugh.

Just do left 4 presses then fire 4-6 times, watching score.

Actually — a faster alternative: I could make verification easier by adding a legitimate gameplay aid... no.

Let's think about tool latency: each key call took maybe 2-5s. After 4 presses, ~10-20s elapsed → formation speed increases? Only with kills. Speed = 30px/s constant initially → in 15s it moves 450px → definitely bounced (bounces after 3.6s). Bounce cycle: travels 107px right (3.6s), then reverses, travels until left edge <10: leftmost from 252 back to 10 → 242px → 8s, etc. So formation is bouncing around. It's hard to predict exactly.

But: total horizontal range is limited (canvas 900 wide, formation 638 wide → it can only move ±~130px in x from center!). Wait: formation width 638, canvas 900 → the formation's left edge ranges between 10 and 900-638-10 = 252. So col4 center ranges between 10+232+29=271 and 252+232+29=513. So col4 center ∈ [271, 513]. Player can be anywhere in gaps.

So if I position player at x ≈ 450+... hmm, but 450 is under bunker2 (gap? no: bunker2 spans 415-485, 450 is under it).

Choose position: gap2 = 490..695. col6 center ∈ [271+116, 513+116] = [387, 629]; col7 center ∈ [445, 687]. So a player at x ≈ 580 covers col7 range partially. As formation bounces, col7 center sweeps 445→687. If player at 580, whenever col7 center passes 580±18 → hit. Time spent within ±18 of 580: formation speed 30-125px/s → 36px window → ~1.2s (at 30px/s) to 0.3s. Firing rapidly while waiting: I press Space every ~2-4s → each shot is a random sample → 62% hit.

Honestly just firing 5-6 shots from a gap gives high probability. Let's do it.

Move right: need x ≈ 560-600 (comfortably in gap 490-700). From 450 → +130px → 12 presses at 11px... too many.

Hmm, 11px per press is the killer. Wait — why so little? key action keydown+keyup quickly. Movement per press = 320 * holdDuration. 11px → 34ms hold.

Alternative: can I make the `key` action repeat? Maybe passing text with repeated keys? The tool's `key` action takes `text` — maybe it accepts "ArrowRight ArrowRight"? Unknown.

Or use `type` action? Types text — keydown for each char? If `type` sends keydown/keyup per char, and if I focus... typing 'd' characters would generate keydown 'KeyD' events! If the game listens on window keydown for KeyD, typing "dddd" via the `type` action would move the player right! But `type` types into an input/textarea — does it dispatch real key events on window? Typically yes (real keyboard events target the focused element, bubbling to window).

Is there a focusable element? I can click on the canvas first (click sets focus? canvas isn't focusable by default... but key events go to document.body anyway and bubble to window). The `type` action might fail if no editable element is focused.

Let's try: click on the page body then `type` "dddddddddddd". If it errors, fall back.

Actually simpler: the `key` action might accept a string like "d d d d"? Let's just try `type` with d's after clicking somewhere non-interactive (e.g., title area).

Alternatively — reduce the number of needed presses by firing from wherever a gap happens... 

Or another approach: I can also verify scoring by waiting for the *formation* to move over the player's column: player at 450 is under bunker2 → shots always blocked. So must move.

Let's try the `type` approach: click at (600, 470) area (overlay gone) then type "dddddddddddd" (12 d's). If each keydown repeats while held... type usually does quick keydown/keyup per char; movement accumulates: 12 * 11px = 132px → x≈582 ✓ in the gap.

Let's try.

Time is limited. Let's do the `type` approach quickly to move right, then fire.

Actually — important remaining check: alien kill → score increase. Let's move into the gap and fire a few times.

Try `type` with "dddddddddddd".

`type` didn't move the player (CANNON 450 still) — probably the type action targets an input, or the keys weren't dispatched as KeyD (maybe it typed into nothing).

Formation has moved left to near edge (leftmost at screen 140 → canvas ~14). It's about to bounce right.

I have ~5 minutes. Essential remaining check: alien kill → score. Let's use repeated ArrowRight/ArrowLeft presses efficiently.

Formation left edge ≈ canvas 14; col4 center = 14+232+29 = 275. Player at 450 (under bunker). Move player LEFT to gap 205-415 → target ~275 (aligns with col4 center!). From 450 → 275 = -175px → 16 presses. Too many.

Alternative: player moves right into gap2 (490-700) needs only +40px → 4 presses → ~494. Meanwhile formation bounces right at 30px/s (increasing as aliens die, none die). col5 center = 14+290+29 = 333 → moving right; reaches 494 after +161px → 5.4s. col6 center = 391 → reaches 494 after 103px → 3.4s. col7 = 449 → 45px → 1.5s. So within ~2s of me firing, col7/col6 will sweep past 494... but at 494 (edge of gap; bunker2 ends 485, shot spans 492.5-495.5 ✓ clear).

So: 4 ArrowRight presses then fire ~3-4 times. Each press ~3-6s though — by then formation will be elsewhere but sweeping continues; it bounces right until right edge hits 890: right edge currently = 14+638 = 652 → travels 238px → 8s, then bounces left, travels back... So over 30s the columns sweep repeatedly. Each Space press = 62% hit chance. 4 presses → 94%.

Let's go: press ArrowRight 4 times (4 calls), then Space 3-4 times (4 calls), inspect. That's ~8 calls in maybe 3-4 minutes. Tight. Let's be efficient: after 2 ArrowRight presses (x≈472, still under bunker2 edge... 472 shot spans 470.5-473.5 < 415-485 → blocked). Need x>486.

Alternatively 2 ArrowLeft presses → 428 (blocked too, bunker2 spans 415-485). Need x < 413.

Left gap needs 4 presses (450→406), right gap 4 presses (→494). Equal.

Go: 4× ArrowRight.

Actually, wait: is there any chance the click at (600,720) or type affected focus such that key events don't reach window? The ArrowLeft presses worked before. Let's proceed.

Also possible: `type` didn't work because no input focused — fine.

Press ArrowRight now.

Player at 455 (moved 5px — press duration varies). Need ~494: 4 more presses minimum. Time is short (~4 min).

Faster alternative: instead of moving to a gap, note the player could fire through the bunker once a hole exists! The middle bunker already has big holes (BUNKER 207, middle bunker visibly has a gap). Look at middle bunker screenshot: it has a notch/hole around x≈600 screen. If a hole aligns, the shot can pass through — but erosion holes are small (16px) vs shot 3px, could pass.

Actually simpler: the left portion of middle bunker... it looks eroded at the right side (screen 630). Player at 455 → shot at 453.5 → canvas... player is at 455 canvas; bunker2 spans 415-485; the hole in bunker2 appears at screen 610-645 → canvas (610-125)/1.05=462 to 495. So the hole is at canvas ~462-485 (right part). Player shot at 453.5 would need to align with hole.

Rather than this, just move right 4 more presses (4 calls) then fire (1-2 calls). Total 6 calls ≈ 1.5-2 min. Feasible but risky.

Alternatively fire from 455 now and hope it passes through a hole? Unlikely.

Better idea: move LEFT toward gap 205-415 — from 455 that's more presses. No.

Alternative: I could increase per-press movement by holding longer — not controllable.

Hmm, what about clicking on the canvas and using the `key` action with text "ArrowRight" repeatedly — same.

Decision: 3 more ArrowRight presses, then Space ×2.

Actually, there's another approach to guarantee a hit: fire from under bunker — blocked. What about waiting for aliens to descend? No.

OK go. Let's press ArrowRight twice quickly then check.

Note each tool call returns a screenshot, costing tokens. Let's just do it.

Player at 466, still under bunker2 (415-485). Need ≥ 487 → 2 more presses (each ~11px → 488 after 2). The middle bunker's right portion is heavily eroded (screen 620-645 → canvas ~471-495?). Actually the middle bunker now shows damage on its right side — canvas cells c≈10-13 removed. A shot at 466 (cells c=10 → 415+50=465-470) — hmm the bunker at screen 565-645 maps to canvas 419-495. The eroded part is the right third (~canvas 465-495). So a shot from x=466 might already pass through a hole!

But careful: hole must be at rows below... The hole in the middle bunker appears at the right side, top rows eroded (screen 565-645, y 575-635; eroded region appears at right of bunker around x 620-645 → canvas 471-495, and the eroded chunk seems upper-right).

Shot at 466 → cells c = floor((464.5-415)/5)=9, c1=floor((467.5-415)/5)=10. Cells 9,10 — from screenshot, is there solid material at c9/c10? The bunker's right part looks eroded from ~c10 onward at upper rows.

Risky. Just press ArrowRight twice more then fire.

Let's do 1 press, then 1 press, then Space. Time ~3 min. Go.

Player at 477, one more press to reach ~488 (gap). Then fire.

Middle bunker now heavily eroded on its right half — a shot from 477 might pass through the eroded right side already (cells c≈12-13 removed?). Bunker spans 415-485 → screen 560-640. At screen 620-640 the bunker looks... currently solid-ish at right? The image shows middle bunker material at screen 565-645 with erosion at top-left? Hard to tell.

One more ArrowRight, then Space.

Player at 455?? It went 477 → 455 (moved LEFT?). And lives now 2! And the bunkers... wait: the bunkers now appear *merged with the alien formation*? Look: aliens are at screen y 415-630, and at y 585-630 there are green bunker-looking shapes intermixed with the bottom alien row (blue octopuses at y 595). Hmm no — the green shapes at (275-345, 585-635) and (555-645, 585-635) and (875-945) are the *bunkers*? But they're at the same height as the alien bottom row!

Wait, that means the aliens have descended to the bunker level (formY large) — the formation bottom row is at screen ~575-620, i.e., canvas ~(575-90)/1.05 = 462 → that's AT the bunkers (460). And the green things ARE bunkers — the middle one at screen 565-645 overlaps... Actually the green shapes are the bunkers, and the blue aliens overlap them visually? The blue octopuses at screen 595 are drawn over/next to green bunker material.

So: aliens have descended to bunker level — meaning they're at canvas y ~ 560-610? Hmm: bottom row octopuses at screen y 575-620 → canvas 462-505. Bunkers at canvas 460-510 → screen 573-626. So yes — the aliens' bottom row is now at the SAME y as the bunkers, i.e., they interpenetrate. The green shapes are bunker remains and the blue things are aliens overlapping them.

Wait but zone line at canvas 545 → screen 662 ✓ (dashed at 662). Aliens at canvas up to 505 < 545, so not yet game over.

Also the player x went 477 → 455: that's a move left of 22px. My key said ArrowRight. Unless... the player was hit (playerHit resets x to center 450) — LIVES went from 3 to 2 ✓ — that explains it: player got hit, x reset to 450, then +5 = 455.

So the player lost a life again (inv expired). And the middle bunker is gone (only fragments remain).

Time: ~1-2 minutes left. I still haven't verified scoring on alien hit. Let's fire NOW: player at 455, middle bunker mostly destroyed (screen shows green fragments at 555-645 which is the middle bunker remnant, canvas 410-495 — the middle bunker is heavily eroded with holes). Firing from 455 might pass through a hole... but the bottom alien row is at canvas y 462-505 — wait, that's *below*? No: aliens descend from top; bottom row at canvas 462-505 means they're just below bunker top (460). If the shot leaves the player at y=566 going up, it first encounters... the aliens at 505 bottom → shot hits alien row bottom at y=505 before reaching bunkers (460-510)? Overlap zone: aliens bottom row occupies 462-505 which is inside the bunker band 460-510. The shot from 566 upward: passes 510 (bunker bottom)... bunker remnants are at 460-510.

Collision order in my update: bunker first, then aliens. At x=455: bunker cells near c=(455-415)/5=8 — is that solid? Middle bunker's arch removed c4-9 at bottom rows (7-9) and c5-8 at row6 → at x=455 (c8), bottom rows are removed (arch) ✓, rows 5-6 may be solid or eroded.

Alien at x=455: formation leftmost ≈ screen 300 → canvas 167; col5 center = 167+5*58+29 = 486; col4 = 428; octopus col4 spans 410-446, col5 spans 468-504. x=455 falls in the gap → miss. Argh.

But the shot could pass through the arch (c8 bottom rows empty) and up to row 5... which if eroded → continues to hit alien row above? The aliens' bottom row is at canvas 462-505 — that's *overlapping* the bunker vertical band. So the shot at y=505 would be checked against bunker first (cells at that y, x=455 → c8: row 5 = y 485-490, row 6 = 490-495 removed... hmm.

I'm out of time for careful reasoning. Let's just fire a few times quickly and check. Even if this one misses, one or two more presses.

Actually — the fastest guaranteed verification: since aliens are now overlapping the bunker band and moving, and time is nearly up... Fire now.

Game Over again (0 lives) — enemy fire is quite punishing because the player sits still while I make tool calls between actions. That's a real observation: the enemy fire rate might be too high for a human? Actually a human dodges. But with the player stationary between my calls, getting hit repeatedly is expected.

Notably, score is still 0 — I haven't yet verified alien kill/score. One essential remaining check. Also the game-over came from lives (aliens were near but not crossed).

Time: ~1 minute or less. Essential fix consideration: is scoring code correct? killAlien sets score, popup, updateHUD — looks right. The only risk is collision. I verified collision logic by reading; but I'd like one empirical confirmation.

Fast path: click RESTART, then immediately (in a tight sequence) fire several shots while the player is at 450 under... blocked by bunker2. Hmm.

Better: after restart, fire rapidly while moving left? Each tool call ~2-4s.

Alternative: verify scoring logic via a quick reasoning + the fact that ALIENS count never changed... no, I need evidence.

Time is critically short. Let me do: click Restart, then press ArrowLeft twice (~428 — still blocked: needs <413)... 4 presses needed. That's too slow.

Alternative: after restart, immediately press Space while at 450 — the shot will hit the middle bunker (blocks). Unless... right after restart the bunkers are full.

Hmm. What if I fire *and* move? Can't combine.

Given ~1 min, I think the pragmatic finish: Restart to leave the app in a clean initial state (which also re-verifies formation), and report honestly that alien-kill scoring was verified by code inspection only... That's weak.

Wait — actually there's a much better trick available: `window.__game.fire()` exists but no JS eval channel... The `inspect` action returns DOM only.

Hmm, but what about the fact that alien bullets are *aimed* at the player and the player dies fast — one could argue difficulty is high. A legitimate tune: reduce enemy fire slightly and increase invulnerability to 2.5s? Not essential.

Actually, one thing IS worth fixing for playability given how often the player died while stationary: fire interval. With 55 aliens: interval = max(0.3, (0.45+rand*0.9)*(1.1)) ≈ 0.5–1.5s, maxShots = 3+killed*6 (3..9 on screen). Bullets fall at ~250-340px/s from y~250 to 576 → ~1.1s flight. So up to ~9 in flight — quite lethal. A stationary player dies in seconds. For a human dodging it's OK-ish but let's soften: maxShots = min(6, 2 + killed*4) and flight... I'll make that one small tuning edit to improve fairness, plus it's quick.

Also initial inv after hit 2.2s is fine.

Given the time, plan:
1. Small edit: cap enemy shots to 6 and widen the fire interval slightly.
2. Reload, verify clean initial state + console errors.
3. Fire score test? If time permits: after reload, press ArrowLeft ~4 times... no time.

Actually — wait. There IS a way to verify scoring quickly: the alien formation starts at x=131 (leftmost alien at ~142). The LEFT gap is 205-415. Player starts at 450. Instead of moving, note that the *right* gap is 490-700 → only +40px = 4 presses; the *left* gap needs 4 presses too. Both too slow.

Alternatively... I could make the player start position at a gap? No — spec says restart restores player position (center is sensible).

Compromise: accept unverified scoring-by-empirics, but make the collision obviously correct by review. Actually let me re-read the collision code quickly for a bug... I'll trust it: rectHit(bullet, alien rect) with alien rect = formX+a.ox, formY+a.oy. Bullet x,y,w,h. That's correct.

One risk: bullets are drawn/updated with `bl.y += bl.vy*dt` where vy = -PLAYER_BULLET.speed ✓ (set as vy: -PLAYER_BULLET.speed ✓).

killAlien: score += a.pts ✓, updateHUD ✓.

OK. Let's do the essential remaining steps fast: apply small fairness edit? Risky to break something at the last second — but it's a one-line change. I'll skip gameplay tuning (not essential) and instead spend remaining effort on: reload to leave clean state, confirm no console errors, done.

Actually, hmm: one genuinely important thing I noticed: score never increased across my whole session, and the requirement explicitly asks to check score feedback on alien hit. Let me make ONE quick empirical attempt: reload → press Space? blocked.

Alternative quick empirical: reload, then press ArrowLeft 3 times in ONE browser block? Multiple browser calls in one block may run concurrently — undefined order but they're key presses; order doesn't matter for net movement (each moves left ~11px). 3 calls in parallel → maybe x = 450-33 = 417 (still >413). 4 calls → ~406 ✓. Risk: parallel execution could collide, but the harness likely serializes. Let's try 4 ArrowLeft in one block, then 2 Space presses in one block (cooldown 0.32 < latency? if parallel they'd both fire only if cooldown passed — second may be blocked; fine, one fires).

Then inspect. Total 3 round trips ≈ 15-20s. Worth attempting.

Do it: reload first, then block of 4 ArrowLeft, then block of 2 Space, then inspect.

I'll risk parallel calls.

Clean initial state confirmed (cannon hidden mid-blink of 1s protection).

Now rapid: 4 ArrowLeft in one block.

The parallel presses ran sequentially-ish: 439 → 429 → 418 → then 450 (player got hit, lives 2, reset to center; explosion visible near cannon). Player now at 450.

The 4th call showed player at 450 due to being hit (lives 2). BUNKER 294.

I'm essentially out of time. The file is saved and in a clean playable state (though lives=2 currently). One last reload to leave it in a pristine initial state and confirm no console errors, then report.

Actually the last screenshot: player at 450 with lives 2. A final reload gives pristine state. Do it and finish.

Final state is clean: 55 aliens, 3 intact bunkers, 3 lives, score 0, cannon centered, no console errors.

The file is saved. Time is up — report.