Space Invaders · step-5-preview

Let me write the game. Single self-contained index.html.

Key features:
- Canvas, procedural graphics
- Cannon move left/right (arrows/A/D), Space fire, controls displayed, cannon clamped
- Alien grid moves horizontally, reverses and descends at edges, fires at player
- Player shots remove aliens + score once
- Destructible bunkers (pixel grid), hits from either side remove material persistently; shots pass through gaps
- 3 lives, enemy shots cost life with brief invulnerability, aliens reaching player zone or 0 lives => Game Over; clearing aliens => win
- Restart restores everything
- Bound projectile lifetime and fire rate

I'll implement bunkers as a grid of small blocks (e.g., 8x6 chunks of 3px each) so shots destroy single cells and pass through gaps.

Let me write it carefully.

Bunker design: each bunker made of cells; width ~ 44 px, height ~ 28 px, cell size 4. So 11 x 7 = 77 cells. Shot collision: check if shot overlapping a solid cell; destroy cell(s) near impact; if no solid cell at shot x, pass through.

For a projectile of size 2x8 (player) — check cells in the path. Simplify: on each bullet update, check overlapping cells; if any, destroy the cells within the bullet's rect at that point (or a small radius) and remove bullet.

Need shots to pass through gaps: since we check actual cell occupancy, gaps will let them through. Good.

Alien hitbox: use pixel-art sprites drawn procedurally with rects; hit detection via AABB.

Let me also add: alien animation frames (2 frames each) drawn with arrays.

Let me draw sprites using string patterns.

Alien types: 3 types with different point values (30,20,10).

Alien movement: classic — move all aliens step by step (frame-based) with speed increasing as fewer remain. Descend when edge hit.

Alien shooting: random selection, fire rate limited, max projectiles on screen.

Game states: 'playing', 'over', 'win'. Restart button + key R.

Invulnerability: ~1.5s after losing a life, blinking.

Player shot: only max 2 (classic). Fire rate cooldown.

Projectile lifetime: player bullet destroyed after reaching top or after lifetime bound (say 2.5s); enemy bullets same.

HUD: score, lives, level, controls text.

Let me write the code.

Canvas size: 800x600. Playfield. Alien grid: 11 cols x 5 rows, cell spacing 44x34, start at top-left 60,60.

Player zone: y >= H - 80 or so. Aliens reaching player zone => game over when alien bottom >= player top.

Let me write.

I'll do a fixed-timestep-ish update with requestAnimationFrame and dt.

Write code now.

Details for drawing sprites procedurally: define patterns as arrays of strings with characters, scale factor.

Squid (top row): 
```
..X..
.XXX.
XXXXX
X.X.X
XXXXX
.X.X.
X...X
```
Hmm let me make a 8x8 approach. I'll define 8-wide sprites.

Actually let's define 11x8 grid sprites.

Squid (type A, 30 pts) frame 1:
```
...XXXX...  (11 wide)
```
Let me just make them 11x8:

Type A (squid):
frame0:
```
...#####...
..#######..
.#########.
##.#####.##
###########
..#.#.#.#..
.#.#.#.#.#.
..#.....#..
```
Hmm, roughly. Good enough.

Type B (crab, 20 pts):
frame0:
```
..X.....X..
...X...X...
..XXXXXXX..
.XX.XXX.XX.
XXXXXXXXXXX
X.XXXXXXX.X
X.X.....X.X
...XX.XX...
```
frame1:
```
..X.....X..
X..X...X..X
X.XXXXXXX.X
XXX.XXX.XXX
XXXXXXXXXXX
.XXXXXXXXX.
..X.....X..
.X.......X.
```

Type C (octopus, 10 pts):
frame0:
```
...XXXXX...
.XXXXXXXXX.
XXXXXXXXXXX
XXX.....XXX
XXXXXXXXXXX
..XX...XX..
.XX.X.X.XX.
XX.X...X.XX
```
Hmm wait 11 wide. Let me count: "..XX...XX.." = 2+2+3+2+2 = 11. ok.

frame1:
```
...XXXXX...
.XXXXXXXXX.
XXXXXXXXXXX
XXX.....XXX
XXXXXXXXXXX
..XXX.XXX..
.XXX...XXX.
XXX.....XXX
```
Widths: "..XXX.XXX.." = 2+3+1+3+2 = 11 ✓

Player cannon:
```
.....X.....
....XXX....
....XXX....
.XXXXXXXXX.
XXXXXXXXXXX
XXXXXXXXXXX
XXX.XXX.XXX
XXXXXXXXXXX
```
Wait that's not great; classic cannon is 13x8:
```
......X......
.....XXX.....
.....XXX.....
.XXXXXXXXXXX.
XXXXXXXXXXXXX
XXXXXXXXXXXXX
XXX.XXXXX.XXX
XX.......XXX
```
Hmm. Let's do:
```
.....X.....
....XXX....
....XXX....
.XXXXXXXXX.
XXXXXXXXXXX
XXXXXXXXXXX
XXX.XXX.XXX
X.........X
```
Fine.

Explosion frames: draw as an expanding ring / particle.

UFO maybe optional — skip or add simple bonus. Skip to keep it simple, maybe add a mystery ship. I'll skip; focus on requirements.

Bunker drawing: rects.

Let me write the HTML.

For bunker damage, on bullet collision: find cells overlapping bullet rect (small), destroy those cells plus maybe neighbors. I'll destroy cells in a small radius (1.2 cell) to look like a bite.

Also simulate "persistent" damage: bunker cells stored as array of booleans per bunker.

Let me write it.

Collision between alien bomb and bunker: bomb goes up, hits bunker from below, destroys cells.

Also player bullet vs enemy bomb? Not required. Skip.

Alien vs bunker: aliens descend and can collide with bunkers; classic destroys them. I'll just have aliens pass over / erase bunker cells overlapping them. Simpler: when an alien's rect overlaps bunker cells, destroy those cells. That adds nice destruction.

Let's code.

Score display, high score maybe.

Now write file.

For keyboard: prevent default for arrows/space.

Restart button: DOM button overlay.

Let me write the code now.

Canvas coordinate layout:
- W=800, H=640 maybe. Let's use 800x640.
- Player y = H - 70.
- Player zone line at H - 100 (drawn as green line).
- Bunkers at y = H - 160, 4 bunkers spaced.

Alien grid: cols=11, rows=5. alienW = 32, alienH = 24 (8 rows * 3px scale = 24). spacing x = 52, y = 40. Start x = 60, y = 70. Total width = 10*52 + 32 = 552. center: (800-552)/2 = 124. So startX = 124, startY = 70.

Alien move speed: base 22 px/s horizontally? Classic steps. I'll use continuous px/sec with step-based movement for retro feel: use discrete steps every `moveInterval` seconds. Interval decreases with fewer aliens: interval = clamp(base * aliveCount/total, 0.03, base). base = 0.5s. Hmm with dt-based stepping it's smooth enough. I'll do stepping: every interval, move all aliens by stepX (8px) and toggle frame; if any alien would exceed bounds, reverse direction and step down by 14 px.

Fleet edge check before moving.

Alien bombs: spawn every N ms, max 3-4 concurrent. Speed ~ 220 px/s downward.

Player bullet speed 520 px/s upward. Fire cooldown 0.28s. Max 2 on screen? Classic 1. I'll allow 3.

Lifetime: bound bullets at 2.5s.

Alright, writing.

For the game over / win overlay: draw semi-transparent panel with text, plus DOM button? I'll draw in canvas and also have a Restart button in DOM below the canvas that's always visible. Simpler: DOM overlay div with button, shown based on state. Let's just do canvas-drawn text + a persistent DOM Restart button under the HUD. Actually let's put restart button in DOM inside the HUD area — always clickable.

I'll implement both: space/R restarts when in over/win state.

Let me write.

Also add sound? No, keep silent (procedural beeps could be nice with WebAudio but not required; adding simple beeps is fine and no network). I'll add a tiny WebAudio beep for shots/explosions with try/catch. That's safe. Keep it optional with mute toggle? I'll add minimal sound with a mute button. Hmm, risk: autoplay policy — audio context created on first user gesture. Fine.

Actually let me keep it simple but include sound since it's procedural and no assets. I'll guard errors.

Write now.

There's a CSS typo I accidentally introduced: `border:1px solid #263kara;` — I wrote a duplicated line, second one overrides, so it's fine but let me clean it. Also let me check the `animTimer` weirdness (leftover no-op). Let me clean those up.

Also, `wave` increment on win - but reset sets wave to 1; the win overlay says "WAVE CLEARED" then Restart resets. That's acceptable. Actually maybe better: on win, advance wave and restart the formation with more aliens... but spec says "clearing the aliens shows a win state" and Restart restores everything. Keep as is.

Let me fix the CSS typo and the no-op line.

The game renders. Now let me test movement and firing. I'll hold ArrowLeft then Space, and check the cannon position via DOM inspection. Let me use the inspect action to check state — but state is inside a closure. I could instead evaluate via the canvas... Hmm, the inspect action returns DOM. Let me check if I can evaluate JS in the page.

Let me try browser inspect with some script. Actually the tool description says "Reload after editing. DOM/console" inspection. Let me try clicking and keys and observe visually.

Test plan:
1. Press ArrowLeft held (key down) - but the tool's "key" action probably taps. Let me send multiple left keys and screenshot.
2. Press Space and screenshot to see bullet + score changes.

To verify internally, I could expose state to window for debugging. That's a reasonable debugging aid — let me add `window.__game = {...}` debug hook. It's harmless. Actually, let me add a minimal debug getter.

Let me add it: expose a function returning state summary.

No direct debug port. Let me just use the browser tool with inspect after reload — maybe inspect can run JS? Let's try `{"action":"inspect"}` — it gives DOM. Hmm.

I'll test via keyboard input and screenshots. Let me hold left by sending the key action multiple times? The `key` action likely does keydown+keyup quickly, which would move only a tiny amount. Let me check by sending several lefts and screenshotting.

Actually for movement verification, holding a key is important. Let me try `key` with text "arrowleft" and see if it sends repeat. Alternatively use `type`.

Let me test: reload, then send key arrowleft several times, then inspect DOM (won't show position). Hmm, position is only visible in screenshot. That works visually.

Better approach: I can temporarily add a DOM element that mirrors the debug state so `inspect` shows it. Let me add a hidden debug div updated each frame. Actually let me just add a visible-but-small status line in the HUD showing player X. Hmm, that clutters. I'll add a hidden `<div id="dbg">` updated each frame with the debug JSON — inspect output includes DOM text, so I can read it.

Let me do that: a span with id "dbg" style display:none... but inspect might not show hidden elements. Let me make it visible but tiny/low opacity at bottom. Simpler: put it in the HUD as small gray text. It's a debug aid; I can keep it but it's ugly. Let me make it absolutely positioned offscreen (position:absolute;left:-9999px) — inspect may still include text. Risky.

I'll make it small muted text under the canvas controls. Acceptable and could even be informative. Actually let me keep it minimal: a single line "DBG" in dim color, 11px. I'll remove it at the end? Removing means re-verification. Let me just keep it — it's low impact. Hmm, cleanliness matters. Alternative: keep `window.__invaders` and use console.log from within the page, then read console output in browser inspect.

Best: the page itself logs debug info to console periodically when a flag is set. I can set the flag... but I need to set it before.

Simplest: have the game log to console on each restart and on key events? Let's have console.log a debug snapshot whenever the player fires, whenever an alien dies, whenever a life is lost, and on game over/win. Then I can inspect console after those interactions. That's actually useful and legit.

Let me add `console.log('[DBG]', JSON.stringify(window.__invaders()))` at those points. Slight noise but fine. Actually console noise in a game isn't great for the final artifact. Let me gate it behind `window.__DBG`:

```js
function dbg(msg){ if(window.__DBG) console.log('[DBG]'+msg, JSON.stringify(window.__invaders())); }
```

And expose `window.__enableDebug = () => { window.__DBG = true; }`. But I can't call it without an eval tool...

OK, I'll take a different approach: use the browser `type` action into the page? No.

Let me check if the inspect action supports executing JS — try inspect with some text? The schema only has action/screenshot/motion params. Let's try action "inspect" and see what it returns; maybe it includes full HTML including hidden text.

Actually — simpler idea: I can make the debug info visible in the DOM as a legit feature: a "status" readout in the controls footer, e.g. "Aliens: 55 · Bunker integrity". That's a design choice and useful for the player to see. Then inspect shows it. Let me add a compact stats bar: ALIENS, BUNKER %. That's reasonable game UI.

I'll add: in the controls area, a span showing "ALIENS n/55 · BUNKERS xx%" updated each frame (throttled). And also player position in the HUD? For movement verification, the aliens count will change as I shoot, and I can verify cannon position from screenshots.

Let me add the stats line.

Only some edits applied? The tool call failed entirely (atomic). Let me redo with the correct anchors. First, add statsTimer declaration near the other lets, and modify loop.

Line 841 for the loop. And syncHUD at 409.

The stats span isn't showing in DOM. It's inside #controls div... wait, I added it inside the `#controls` div? Let me check: the edits added it after "Pause" span, which is in the #controls div. But the DOM output shows "Pause: P" then "Procedural graphics...". The stats span should appear between. It's empty (no text) because stats update only every 0.2s and... it should have text. Hmm, maybe the DOM snapshot is taken right at frame 1 before the stats update. Actually dom is captured after load; frame 1 is at +0ms. The screenshot shows the game rendered though (multiple frames passed).

Let me re-inspect to get the current DOM.

Interesting - the screenshot shows a red projectile (enemy bullet) mid-screen and a pink one below. Wait, the aliens at the left look cut off... Actually in this screenshot the fleet seems shifted. Also note the HUD shows 2 lives icons in the earlier shot but here "LIVES" then two icons? Let's look: HUD text shows "LIVES" then the icons. Hard to tell. The DOM says ALIENS 55/55, so no life lost yet. But the previous screenshot showed 3 icons? Let me re-check: first screenshot HUD showed "LIVES ▲▲▲" (3 icons). Second: "LIVES ▲▲"? The text rendering in the inspect output doesn't include icons. In the first attached image I saw 3 green icons. In this new one, I see "LIVES" followed by what appears to be 2 icons. Hmm, that suggests a life was lost between? But ALIENS is still 55/55 and score 00000. If a life was lost, syncHUD would run. Wait — the screenshot might be from before... no, it's the current frame.

Hmm, actually wait. Look at the first image's HUD more carefully. Let me zoom mentally: "LIVES ▮▮▮" - three. Second image: "LIVES ▮▮" - two? That would mean a life lost. But lives lost only from enemy bullet hit, and score/aliens unchanged. Possible! An enemy bullet could have hit the player. That happened between the reload and now (few seconds). Plausible: enemy bullet hit player, life lost, lives=2.

But wait — the fleet hasn't moved in the second screenshot? Compare first and second screenshots: in the first, the leftmost alien column starts at around x=185; in the second, similar. Actually the fleet does move but only 9px per step, roughly 0.46s per step, so in ~4 seconds it'd move ~8 steps = 72px. Hmm, the second screenshot shows the fleet roughly in the same place... Actually looking closer, in the second image the top-left alien appears at nearly the same x. Let me verify movement is happening by comparing alien positions over time.

Hmm, also concerning: the aliens should be moving. Let me check the fleet movement — STEP_BASE 0.46s per 9px. Over 5 seconds that's ~10 steps = 90px shift. That should be visible.

Wait, looking at the second screenshot again — the fleet looks identical to the first. And the frame is only "+0ms" in both, meaning each inspect/reload creates a new frame. Hmm, "Frame 1" is the browser tool's own frame counter, not the game's.

Hmm, actually maybe the browser tool serves a cached version? The stats show BUNKER 71% which is new (proving the new file is loaded) and CANNON X 386. So the new file is loaded. But the screenshot might be a fresh page load each time (state reset). The presence of an enemy bullet mid-screen and a life lost suggests some time passed.

Wait, if the page reloaded fresh, lives would be 3. Unless... the inspect action reloads and then the screenshot catches it after a couple seconds.

Let me consider: does the fleet actually move? Let me test deterministically: use `motion` to get multiple frames? The `motion` action captures motion frames. Let me instead take two screenshots with a delay. There's no "sleep" param. Let me use `motion` which might capture frames over time showing animation.

Alternative: add the fleet's leftmost alien X to the stats readout. Let me add "FLEET X" to the stats so I can verify movement via DOM. That's the cleanest way.

Let me update the stats to include fleet min X and fleetDir.

The DOM snapshot is captured right at load (before stats update). I need to inspect after a delay. Let me just do `inspect` without reload — that gives the current DOM after time has passed.

Interesting: FLEET X 187 — hmm, FLEET_START_X should be (800 - (10*52 + 33))/2 = (800-553)/2 = 123.5. But FLEET X shows 187? That's the leftmost alive alien's x. Wait — 187 > 123.5. Hmm, maybe fleetMinX initialized to 0 and my check `if(a.x < fleetMinX || fleetMinX === 0)`. Initially fleetMinX=0, first alien x=123.5 → since fleetMinX===0, set to 123.5. Then... no, it says 187.

Hmm wait, BUNKER 70% at load and then 70% — but erosion! bunkerShape has solid count... let me compute: 11*7=77 cells. Rounded top corners: y=0 removes 2, y=1 removes 4 (x<=1 or x>=9 → x=0,1,9,10 = 4 cells). Side slope y>1 & (x==0 || x==10) removes 5 each side? y=2..6 is 5 rows × 2 = 10 cells. Archway y>=5 (BUNKER_ROWS-2=5) and x 4..6 → y=5,6 → 2 rows × 3 cols = 6 cells. Total removed = 2+4+10+6 = 24. Solid = 77-24 = 53. 53/77 = 68.8% ≈ 69%. It shows 70% — one cell more lost? 54/77=70.1%. So one cell eroded. That's the aliens eroding bunkers? At start aliens are far above bunkers (y 74..234, bunker at y=470). So `rectsHit(a, {x:0,y:BUNKER_Y,...})` — BUNKER_Y = H-170 = 470. Aliens at y<260. No overlap. Hmm.

Wait — maybe the erode happens when aliens pass over? No. Let me reconsider: maybe it's the "70%" vs "69%" is just Math.round of 68.8 → 69. It shows 70. One extra cell. Where from?

Oh! The enemy bullets hitting bunkers. In the screenshot there are enemy bullets visible. Over a few seconds an enemy bullet hits a bunker and removes a cell. That explains it (plus the life lost earlier). So that's working.

But FLEET X 187 vs expected 123.5. Let me recheck: FLEET_START_X = (W - ((COLS-1)*CELL_X + ALIEN_W))/2 = (800 - (10*52+33))/2 = (800-553)/2 = 123.5. First alien at 123.5. Screenshot at load: leftmost alien appears at about x=185 in canvas pixels (in the scaled screenshot: canvas width 800 mapped to ~930px wide in the image... the image is 1200px wide viewport). Hmm, let me measure: in the screenshot, the leftmost red alien column looks like it starts around x≈190 (of 800 canvas coords, mapped to about 940 display px → factor ~0.85... wait the canvas occupies most of the 1200px viewport: wrap is min(96vw,800) = 800 CSS px. The canvas is 800 wide scaled from the 800x600... 800 wide → image x for canvas ≈ (1200-800)/2 + border = 200. So display x 200..1000. The leftmost alien in the image appears around display x ≈ 390 → canvas x = (390-200) = 190. Yes! matches FLEET X 187.

So the aliens start at x≈187, not 123.5. That means my FLEET_START_X computation is off... wait no. Let me recompute: is CELL_X = 52? Yes. COLS=11. So the fleet spans 10*52+33 = 553 px. Centered: (800-553)/2 = 123.5. Hmm.

Unless... aliens move! Between the reload and the inspect, ~1-2 seconds passed. 0.46s per step → maybe 2-4 steps × 9px = 18-36px. 123.5+... no, 187-123.5 = 63.5px ≈ 7 steps. Hmm, that's ~3.2s of movement. But BUNKER 70% means enemy bullet already hit which takes time too. Actually the frames show time passing.

Wait, but also: at reload, the screenshot immediately showed the fleet at the same place in both reload and inspect (looks identical). Let me measure the very first screenshot: the leftmost alien there also appears at ~190 display px. Hmm, both reload-screenshot and inspect show ~same position. If the fleet moved 63px between reload and inspect, the screenshots would differ.

Look at first reload image vs inspect image: In the reload image, top-left alien at display x≈388; inspect image ≈390. Basically identical. So the fleet did NOT move ~63px. So FLEET X must be ~123 at load and 187 later? But screenshots identical...

Hold on. Let me re-look at the reload screenshot: the alien grid appears to span from about display x 388 to about 885. In the inspect screenshot: 390 to 887. Same.

So the fleet is static?! And FLEET X 187 means it started at 187?

Hmm, let me recompute CENTERING. Actually wait — maybe I should double check `rectsHit`/`stepFleet` isn't running. `updateFleet` is called in update... `fleetStepTimer += dt; while(fleetStepTimer >= interval)`. That should work.

Unless... `state` is 'playing'? Yes.

Wait, maybe the reload screenshot and the inspect screenshot are actually the SAME image (the tool returns the last screenshot?). The attached image is identical in both cases which is suspicious — "Frame 1, +0ms" both times. It seems each tool call reloads/re-inspects and gives a fresh screenshot. But the images look the same... The difference between the reload image and inspect image is subtle: in the inspect image there's an enemy bullet at mid-left (display x≈365, y≈330 display) and another near the bottom (x≈905). In the reload image, I see an enemy bullet at display (905, 565) near the bottom right, and one at (365, 330)? Looking at reload image: yes there's a pink dot at around x=365,y=330 and one at x=905,y=565. And the inspect image: at 365,330 and 905,565 too?? Both show the same two bullets in the same spots!

That means... the browser tool is returning the same screenshot (cached frame). Hmm, or the game is paused/not updating?

Hmm! Actually maybe the browser harness captures the page once and the screenshots are the same image because the harness reloads and then immediately screenshots at a similar elapsed time. Bullets at identical positions is a strong coincidence though.

Let me test more explicitly: take a screenshot now (later in time) and see if the scene differs.

Actually, wait. There's a real possibility the game IS running but the browser screenshots are stale/cached. Let's test by pressing a key (fire) and screenshotting — the bullet/particles should differ.

Also, importantly: the `dir 1` and FLEET X 187. Let me just compute what the code says by reasoning again... Actually, hmm! I wonder if `motion` action works better. Let me first try `screenshot` now (after some real time has passed since reload).

Now FLEET X 151 dir 1 (was 187, now 151 — moving left, dir... wait dir 1 means +STEP_X, so it should increase. 187 → 151 means it moved LEFT. Hmm, dir 1 = +x direction. But it decreased by 36 = 4 steps. And dir is still 1...

Wait, that's contradictory. Unless my stats read happens to be at different fleetDir readings. Or... FLEET X went 187 → 151 means direction is -1 at that moment, but the readout says dir 1 because the direction flipped back? Let's see: fleet starts at 123.5 with dir=1, moving right. Reaches x=187 after ~7 steps. Then continues right to 522 (max, W-10-33=757? Actually maxX = a.x+33; the rightmost alien at 123.5+520=643.5, +33 = 676.5. So it can go right until 676.5 > 790 → needs mx > W-10=790. So from 643.5 to 757, that's 113.5px ≈ 12.6 steps). Then dir flips to -1, and moves left. Then FLEET X would decrease from 757 down. So the sequence 187 → 151 with dir 1... doesn't match unless between the two reads it hit the right edge and flipped back to left and came back to 151? No, it'd have to travel 757→151 = 606px which takes many steps.

Hmm wait, maybe I mis-assumed. Let me re-derive: maybe FLEET_START_X is not 123.5. If the fleet's leftmost is at 187 at some point and it's decreasing... Let me reconsider: maybe `dir 1` displayed is stale because `fleetDir` is read at stats time... it's read live, so it should reflect.

Hmm, unless dir oscillation. Let me think about the edge detection bug: `minX`/`maxX` computed over alive aliens. Step: nx = minX + dir*STEP_X; if nx < 10 or mx > W-10 → reverse & descend. With dir=1 initially the fleet moves right. Reaches right edge, flips to -1. Moves left. Then when minX - 9 < 10 → flips to +1 and descends. Fleet left edge min 10, so it oscillates between 10 and 757. That's a huge horizontal sweep (747px), taking ~83 steps. Hmm, that's too wide — the fleet would sweep the entire screen width. That's not great: the fleet should stay near its original width span, i.e., only 800-553 = 247px of travel. But since the edge check uses only the leftmost/rightmost ALIEN positions, when the fleet is full width (553px), it can only move 247px total. Right! Because minX=123.5, maxX=676.5. Moving right until mx > 790: 676.5→790 = 113.5px = 12.6 steps. Moving left until nx < 10: 123.5→10 = 113.5px. So total sweep 247px. So leftmost x ranges from 10 to 123.5+113.5=237.

So FLEET X 187 (within [10,237]) ✓ and 151 (within range) ✓. But dir should have been -1 at 151 if it was 187 earlier with dir 1... unless between reads it went 187 → 237 → (flip) → 151. From 187 to 237 = 50px = 5.5 steps, then 237 to 151 = 86px = 9.5 steps, total 15 steps ≈ 15 × 0.46s = 7s. The time between my two inspects was indeed several seconds (I slept 3s plus overhead). But then FLEET X should have shown dir -1 on the way down... unless the read at 251 caught it at 237→151 moving left, but the printed dir is 1.

Hmm, wait. Actually maybe I have the sign backwards: let me re-read. `nx = minX + fleetDir*STEP_X`. With dir=1, x increases. And I print `fleetDir` = 1. So at FLEET X 151, dir 1 means it was moving right from 10 toward 237. So sequence: 187(dir 1) → 237 → flip to -1 → 10 → flip to 1 → 151. That's 5.5 + 25 + 15.7 = 46 steps ≈ 21s. Too long for the elapsed time between reads.

Unless... the timing is faster than I think. Hmm, actually there might be MANY more seconds elapsed than I think, since each browser call might have overhead. Also `interval` = STEP_MIN + (STEP_BASE-STEP_MIN)*ratio^1.35 with ratio=1 → 0.46s. So ~2.2 steps/sec. For 46 steps: 21 s.

Alternatively, the browser tool's page might have been running much longer (each of my calls takes time).

Anyway — the fleet IS moving (187 → 151) and oscillates, and it descends on edge hits. Good. But wait, a concern: does it descend? The screenshot of the fleet: in the first screenshot the fleet rows looked at certain y; the latest one too. Can't tell.

Let me verify descent separately via a different approach: check the bunker % dropping due to alien erosion later, or just trust the logic. Better: I'll test alien motion + descent by watching FLEET X oscillate and checking y positions. Let me add "FLEET Y" to stats. Actually I computed fleetMaxY but didn't print it. Let me print it.

Also important issue: the fleet sweep of 247px is fine.

Now, a big issue: the aliens bounce at the edges but the descent happens only when hitting an edge. Fine.

Let me now:
1. Add FLEET Y (bottom) to stats.
2. Test firing: press space and check score/aliens drop.

Let me also check for the lives issue: earlier HUD showed 2 icons in one screenshot while ALIENS 55/55. That's expected (enemy bullet hit).

Let's add FLEET Y and test firing.

Good. Now `let lives = 3;` — lives variable declared once (line 345) and `resetGame` assigns `lives = 3;`. Fine.

Now reload and test firing. To fire repeatedly, I need to send space key events. The `key` action with text " " — space. Let's try pressing space several times and then inspect. But keydown/keyup pairs mean only one shot per press (cooldown 0.26s so multiple presses needed).

Let me try the `key` action with text "Space" or " ".

Now let me test movement with the left arrow. The key action probably does keydown then keyup. To move noticeably I need many presses or a held key. Let me check if `key` supports a hold (maybe it just dispatches). Let me send 10 left-arrow presses and then inspect to see CANNON X change. Actually each keydown sets keys['arrowleft']=true, then keyup sets false. Between them, one frame at 60fps → 5px. So 10 presses ≈ 50px. Detectable.

Actually, a better test: use `drag`? No. Let me try pressing "a" 12 times.

Hmm, but each browser call is a round trip. Let me first test one arrow key press and see the delta.

Hmm, FLEET X is now 214 with Y 258 — wait, the fleet bottom Y is 258, same as expected start (74 + 4*40 + 24 = 258). Good, no descent yet (fleet hasn't hit an edge within this short time, or it has but... FLEET_START_Y=74, rows 0..4, last row y = 74+160 = 234, +24 = 258. Yes, Y 258 = no descent yet).

Hmm wait, earlier FLEET X was 187, then 151, now 214 — oscillating. And Y still 258 means no edge hit yet? At 151 and 214... if it oscillates between 10 and 237 it would have descended. Hmm, unless the reload reset it. After reload (this session), FLEET X went 187 → 214. That's within range and dir 1. OK consistent: at load 123.5, moving right; first inspect at 187 (7 steps ≈ 3.2s), now 214 (10 steps ≈ 4.6s). Good, and Y 258 = no descent yet. 

Now, the cannon X 386 didn't change after ArrowLeft. So the key press didn't register as movement, OR the key press moved it and then... 386 is the exact center (800/2-28/2 = 386). It didn't move.

Maybe the browser `key` action requires focus on the canvas/document. The event listener is on window. Perhaps the tool sends keys to the page but the body isn't focused. Hmm. Let me try clicking the canvas first (which also is a pointerdown → resets on over/win... no, state is playing so it just moves the player to the pointer).

Let's click at a position left of center on the canvas, then inspect. That tests pointer steering at least.

Then for keyboard, try `type` action with text "a" or "ArrowLeft".

Let me try clicking on the canvas at x=300 (canvas display coords). The canvas spans from display x≈200 to 1000 (width 800 CSS). Canvas display left ~201, scale 1 (800 CSS px wide = 800 canvas px). So canvas canvas-x = clickX - 201.

Let me click at display x=400 → canvas x=199 → player.x = 199-14 = 185.

But careful: pointerdown also triggers resetGame if state is over/win — it's playing, fine.

Important! FLEET Y is now 274 = 258 + 16 → the fleet has descended one row. Good, that confirms descent at the edge works (FLEET X 115, dir -1 → it reached min and descended).

But CANNON X still 386 — the click didn't move the cannon. So pointer events aren't reaching? Or the click coordinate was outside the canvas (y=600 in viewport; canvas top is around y=118 and bottom y=633... let me compute: canvas is 800x640 scaled to width 800 → height 640. The wrap starts below h1 and HUD. In viewport 1200x800: h1 at ~y=30, HUD ~y=75-110, canvas from ~y=115 to y=755. So y=600 is inside the canvas. x=400 is inside too (canvas x from ~200 to 1000).

Hmm so click at (400,600) should map to canvas x≈200. But CANNON X 386.

Unless the click action's coordinates aren't in viewport pixels but relative to something else, or the click landed on an overlay. Or the pointer event listener needs `e.buttons`... For pointerdown I call pointerMove(e) which uses e.clientX. That should work.

Wait — maybe the issue is that the browser tool's click coordinates ARE viewport coords and it clicked, but... hmm. Let me check the `canvas.getBoundingClientRect()`. Fine.

Alternatively, maybe the click was intercepted by the screenshot iframe? The warning about iframe sandbox suggests the page is in an iframe. Click coordinates might be relative to the iframe, not the viewport. The iframe might be offset.

Hmm. And keyboard events also aren't reaching. Maybe keys are sent to the page but... let me test the keyboard by pressing 'p' (pause). If pause works, we'd see the overlay in the screenshot. Let's test that — it's a clear visual signal.

Actually, wait. Let me reconsider: maybe the keyboard events DO reach but `e.key.toLowerCase()` for space is ' ', which is in gameKeys, and firing should occur. Earlier the ArrowLeft press didn't move the cannon, but for a single keydown+keyup pair the movement would be 300px/s * ~16ms = 5px — but CANNON X showed exactly 386 both times. Hmm, with pointerMove not working and keys not working...

Let me test with 'p' to see if any key reaches the page.

Actually, first, maybe the issue is that the page needs focus. The browser harness might need a click on the page to focus it. Let me try the `type` action instead of `key`.

Let me try key 'p' first.

Keyboard DOES work — 'p' toggled pause. So keys reach the page. But ArrowLeft didn't move the cannon?

Wait, when paused, `update` returns early so keys don't move. When playing... Let me check: maybe the key text 'ArrowLeft' isn't recognized and the tool sent something else. Let me press 'a' and see.

Also note LIVES shows 1 icon now — a life was lost (enemy bullets are aggressive). BUNKER eroding (57%). Fleet Y 290 = descended twice. 

Let me unpause with 'p' and then press 'a' a few times.

Actually hold on — while paused, the previous ArrowLeft press happened before the pause. At that time the game was playing and the key should have moved the cannon. Unless the harness sends key events with a very short duration AND the browser's requestAnimationFrame doesn't tick between keydown and keyup. In a headless browser, keydown and keyup may be dispatched within the same frame (no rAF tick in between), so `keys['arrowleft']` is set and cleared before any update runs → movement = 0. That explains it!

For pause, it's a toggle so it works regardless.

For space fire: also requires a frame between keydown/keyup → won't fire.

So to test movement/firing, I need a held key. The `key` action may support holding if I send keydown only... Let me check the tool: action "key" with text. Probably press+release.

Options:
1. Use `type` action — types text, generating keydown/keyup per char. Same problem.
2. Use `drag` — pointer drag on canvas: pointerdown then pointermove → my pointermove handler requires e.buttons. A drag from left to right on the canvas would move the cannon! That tests pointer steering, not keyboard, but movement works.

Alternatively, I can verify keyboard handling logic differently: I trust the standard keydown/keyup implementation. But I want to verify the cannon actually moves with arrows. Since I can't hold a key, I could use `drag` on the canvas to verify movement, and rely on code review for keys.

Hmm, but wait: maybe I can simulate a hold by using the `type` action with a long repeated string? No.

Better idea: temporarily change the input handling so that a keydown alone (without needing a frame) queues a "move impulse"? No, that changes game feel.

Alternative: verify with a synthetic test harness. I can create a separate test HTML that loads the game file in an iframe and dispatches synthetic keydown events, waits, then reads `window.__invaders()`. But I can only load one page at a time in the browser tool...

Actually! I can make the game itself run a self-test when a special key/URL param is set. E.g., on load, if location.hash === '#selftest', run an automated test: simulate keydown 'arrowleft' for 300ms, check player.x decreased; simulate space, check a bullet was created; check score; etc. Then log results to console. Then I load index.html#selftest and inspect the console output. That's a clean, verifiable approach and I can keep it in the final file (harmless, only active with the hash) or remove it after.

Let me do that — a `#selftest` mode driven by a scripted input sequence. Actually simpler: use real `dispatchEvent(new KeyboardEvent('keydown', {key:'ArrowLeft'}))` on window, and hold it across frames. That tests the actual handler.

Let me write the self-test:

```js
function runSelfTest(){
  const log = [];
  const results = [];
  function T(name, cond){ results.push((cond?'PASS':'FAIL')+' '+name); }
  const snap = () => JSON.parse(JSON.stringify(window.__invaders()));
  // 1. movement left
  const x0 = player.x;
  window.dispatchEvent(new KeyboardEvent('keydown',{key:'ArrowLeft'}));
  ... need frames ...
}
```

Since it's async across frames, I'll use a step-based scheduler with setTimeout/rAF.

Plan:
- step 0: record start; dispatch keydown ArrowLeft; wait 400ms → record player.x; dispatch keyup. Test x1 < x0.
- step 1: dispatch keydown ArrowRight; wait 400ms → x2 > x1; keyup.
- step 2: dispatch keydown 'a' → left again etc.
- step 3: fire space: dispatch keydown ' '; wait 100ms (bullet created immediately on keydown since update happens in rAF); check playerBullets.length>0; keyup. Wait for bullet to travel up and check score/aliens change after a couple of seconds.
- step 4: wait ~2.5s and check score > 0.
- step 5: bunker erosion: check bunker % < 100.
- step 6: restart: dispatch 'r' → check aliens 55, score 0, lives 3, bunker 100%, player.x centered.
- step 7: game over: dispatch r then force lives to... can't access internals from outside. But `window.__invaders` gives lives. I could simulate by setting... not accessible. Skip: I'll instead verify game over via a long-run test? Too slow.

Instead, for game over I can add a debug hook `window.__invaders.force(over)`? Hmm, that's test-only code. Alternatively add a hidden test API: `window.__test = {loseLife, setAlienY, clearAliens}`. That's acceptable as a debug hook, but adds production cruft.

Let me think about what's essential to verify per the task:
- movement & firing ✓ (selftest)
- alien motion ✓ (already observed via stats)
- shot hitting bunker or alien → visible damage / score feedback (selftest covers score; bunker erosion observed)
- Restart → initial formation, bunkers, lives, score (selftest)
- 3 lives, game over on 0 lives, win state — I can add a small test hook to verify, or just carefully review code. I'd prefer to verify. I'll add a minimal internal test hook: `window.__invaders.debug = fn` ... 

Actually, a neat approach: the self-test can trigger a game over legitimately by clearing aliens? No, that's win. For game over: I could wait until aliens descend to the bottom — that takes a very long time (they descend 16px per edge crossing; 258→556 = ~300px → 19 edge crossings... each crossing is ~30 steps ≈ 14s, so ~4.5 minutes). Too long.

Alternative: the enemy bullets will eventually kill the player 3 times, causing game over. Each life takes a few seconds (we saw 2 lives lost in ~20 seconds). So waiting ~60 seconds could naturally reach game over! I can wait and check. That's a legit end-to-end verification. Let me do that in the selftest: after verifying restart, wait up to N seconds polling for state === 'over', then verify overlay is drawn / lives===0. But 60s+ might exceed the time budget (15 min total). I have time; but I also need to be careful.

Alternatively I'll add a compact dev hook that's clearly labeled and used only by the self-test:
```js
window.__invadersTest = { loseLife, clearAliens };
```
Hmm. I think adding a tiny test hook is fine and pragmatic — many games ship a debug API. But the task says nothing about it. I'll include `#selftest` + a tiny `window.__invadersTest` hook since it's genuinely useful. Actually, let me reduce cruft: I'll implement the self-test to use only public DOM/keys plus `window.__invaders` for reads, and for the game-over/win checks I'll rely on natural play (waiting) — risky.

Compromise: I'll add the hook but make it minimal (2 functions), and keep it. It's harmless and hidden.

Let me write it.

Actually, thinking about it more: there's another way to reach game over quickly — the enemy bullet that hits the player. I can make the player stand still in a column where aliens fire. Random. In the selftest, after restart, just wait polling for state==='over' with a timeout of ~45s. From observations, lives drop fast (2 lives lost in ~20s at 55 aliens with 2 enemy bullets). Actually that's fast because bullets fly down and the player is stationary in the middle. Let's wait up to 60s and check. And for win: use the test hook to clear aliens (or just check that `state==='win'` after clearing). Hmm.

Let me just add the hook — it's 3 lines. Then in the selftest: clear aliens → verify state 'win'; lose life 3 times → verify state 'over'.

Let me write the self-test code now, and run it via `#selftest`.

I'll implement:

```js
const TEST_HOOKS = { loseLife: () => loseLife(), clearAliens: () => { for(const a of aliens) a.alive=false; }, };
window.__invadersTest = TEST_HOOKS;
```

Self test driver:

```js
function key(k, down){
  window.dispatchEvent(new KeyboardEvent(down?'keydown':'keyup', {key:k, bubbles:true, cancelable:true}));
}
function sleep(ms){ return new Promise(r=>setTimeout(r,ms)); }
async function selfTest(){
  const out = [];
  const t = (name, ok, extra) => out.push((ok?'PASS':'FAIL')+' | '+name+(extra?' | '+extra:''));
  // fresh start
  resetGame();
  await sleep(50);
  let s = window.__invaders();
  t('initial 55 aliens', s.aliens===55, s.aliens);
  t('initial score 0', s.score===0);
  t('initial lives 3', s.lives===3);
  t('initial bunkers full', s.bunkers.every(v=>v===bunkerSolidTotal), s.bunkers.join(','));
  const cx0 = s.player.x;
  key('ArrowLeft', true); await sleep(400); key('ArrowLeft', false);
  s = window.__invaders();
  t('move left', s.player.x < cx0 - 20, cx0+' -> '+s.player.x);
  const cx1 = s.player.x;
  key('ArrowRight', true); await sleep(400); key('ArrowRight', false);
  s = window.__invaders();
  t('move right', s.player.x > cx1 + 20, cx1+' -> '+s.player.x);
  ...
  // bounds clamp
  key('ArrowLeft', true); await sleep(2500); key('ArrowLeft', false);
  s = window.__invaders(); t('clamped left', s.player.x === 8, s.player.x);
  key('ArrowRight', true); await sleep(4000); key('ArrowRight', false);
  s = window.__invaders(); t('clamped right', s.player.x === W-PLAYER_W-8, s.player.x);
  // fire
  key(' ', true); await sleep(30); key(' ', false);
  s = window.__invaders();
  t('fire creates bullet', s.playerBullets>=1, 'bullets='+s.playerBullets);
  // wait for alien kill
  let killed=false;
  for(let i=0;i<60;i++){ await sleep(100); if(window.__invaders().score>0){killed=true;break;} }
  t('shot destroys alien & scores', killed, 'score='+window.__invaders().score);
  t('alien count decreased', window.__invaders().aliens<55);
  // fire rate / lifetime bounds: hammer space
  key(' ', true); await sleep(1000); key(' ', false);
  s = window.__invaders();
  t('max bullets respected', s.playerBullets<=MAX_PLAYER_BULLETS, s.playerBullets);
  // bunker damage persists + enemy bullets damage
  const bBefore = window.__invaders().bunkers.reduce((a,b)=>a+b,0);
  ... 
  // restart
  key('r', true); await sleep(30); key('r', false);
  await sleep(50);
  s = window.__invaders();
  t('restart: 55 aliens', ...); t('restart: score 0', ...); t('restart: lives 3'); t('restart: bunkers full'); t('restart: cannon centered');
  // win
  window.__invadersTest.clearAliens(); await sleep(200);
  t('win state on clear', window.__invaders().state==='win');
  // restart again then game over
  key('r', true); await sleep(30); key('r', false); await sleep(50);
  window.__invadersTest.loseLife(); window.__invadersTest.loseLife(); window.__invadersTest.loseLife();
  await sleep(200);
  t('game over on zero lives', window.__invaders().state==='over' && window.__invaders().lives===0);
  t('invuln after hit', ...) -- check invuln>0 after a single loseLife
  console.log('SELFTEST\n'+out.join('\n'));
}
```

Careful: while paused, updates don't run. Ensure unpaused (it is playing after resets). Note key 'r' resets state to 'playing'.

Also note `loseLife` sets invuln and if lives 0 → state 'over'. To test invuln: after restart, call loseLife once, then check invuln > 1.0.

Also careful: the enemy bullets during the test could kill the player and flip state to 'over' unexpectedly, breaking later assertions. To make the test deterministic, I should disable enemy fire during the self-test. Hmm. Option: pause enemy bullets at test start via a hook `window.__invadersTest.setEnemyFire(false)`. Let me add a `peace` flag in the test hook that zeroes enemy bullets and prevents spawning. I'll add `window.__invadersTest = { loseLife, clearAliens, peace: (v)=>{peaceMode=v; enemyBullets=[];} }` and in updateEnemyFire, `if(peaceMode) return;`.

That's a reasonable amount of test scaffolding. I'll add it and keep it (guarded, no visual impact).

Also the alien motion test: measure fleet X changing over time, and fleet Y increasing after some time (descend). In the selftest, I can check that the fleet min X changes within 2s (motion) and that direction reverses. Let me include: sample fleetMinX every 200ms for 6s and confirm it changes at least twice direction (or that Y increased). Actually the fleet sweeps 247px at 2.2 steps/s → ~110s for a full sweep... no wait, 247px/9px = 27 steps to traverse from left edge to right edge; 27 × 0.46s ≈ 12.5s. So a full left-to-right sweep takes ~12.5s, and descent happens at each end. To verify descent I'd need ~7s (from center to an edge: 123.5→237 is 12.6 steps ≈ 5.8s) then descent. So wait ~8s and check Y > 258. That's acceptable in the test.

Hmm, but I already observed descent in live play (FLEET Y 274, 290). I'll include a lighter check in the selftest: fleet min X changes over 3s (motion), and after ~9s, fleet Y > 258 (descend + reverse). Let me make it part of the test but with a generous timeout loop.

Total test duration estimate: ~5s movement + 3s fire + 6s score wait + 1s bullets + 9s descent + rest ≈ 30s. OK.

Let me also verify "shots pass through gaps": create a gap in a bunker then fire a shot through it. Test: use the hook to carve a wide gap in bunker[0] (set all cells to 0), position the player under bunker 0, fire, and verify the bullet passes (playerBullets.length stays >0 after crossing the bunker band, or an alien dies above it). Simpler: carve entire bunker 0 empty, place player under it, fire, then check that the bullet's y goes above the bunker top. I can add a debug read of a bullet's y... `window.__invaders` returns playerBullets.length only. Let me add bullet info to the hook: return `bullets: playerBullets.map(b=>({x,y,life}))`. Then test: after firing under a fully carved bunker, within ~100ms the bullet y should be < BUNKER_Y (470) → passed. With an intact bunker it would be consumed. Good test of "shots pass through gaps".

And bunker damage test: fire into an intact bunker and confirm the bunker cell count decreases and the bullet is consumed.

I'll implement these by directly placing the player (hook: setPlayerX) — or just move the player with keys to a position under a bunker. Bunkers are at x = BUNKER_GAP + i*(W_B+GAP). BUNKER_GAP = (800 - 4*44)/5 = (800-176)/5 = 124.8. So bunker 0 at x=124.8..168.8, center 146.8. Player x target = 146.8-14 = 132.8. I can use the hook setPlayerX(x) for precision. Let me add that too: `place(x)`.

OK let me write this. Keep the test code compact and clearly marked. I'll put it all at the end of the IIFE, activated only when location.hash includes 'selftest'.

Let me write the code.

For the extend of `window.__invaders`, add bullets and state readouts.

Let me now write all the edits.

I need to pass edits as an array of objects. Also I accidentally left a syntax error line `const through = S().bullets some;`. Let me rewrite properly using a bash heredoc appending instead. Easier: use write to append? I'll use bash to replace the tail portion.

Let me use python or a heredoc to replace the ending.

python3 not found; so the append didn't happen (the python heredoc failed). Let me use node instead.

Now I need to navigate to index.html#selftest. The reload action probably reloads the same URL (without hash). Let me check if there's a way to navigate with a hash. Maybe `type` into the URL isn't possible. Hmm.

Options: the browser tool reloads the current URL. Can I set the URL? Maybe reload after... The tool has no "navigate" action.

Alternative: make the self-test run without needing the hash — e.g., start it via a keyboard shortcut like 'T' held? Or run it when a query param is present... same problem.

Alternative: use the localStorage flag — I can't set it from outside either.

Hmm, but I CAN type into the page? The `type` action types text into the page (into a focused element). Not the URL.

Wait — maybe reload keeps the hash if it was there. Let me try clicking the Restart button... no.

Idea: I can add a link/button in the page UI labeled "Self-test" that sets location.hash='selftest' (which reloads the page with the hash). Then the browser tool can click that button! That's a clean approach: a small button in the footer.

Actually simpler: pressing 'T' could run the self-test directly in-place. Then I just need to press 'T' via the key action. Since the self-test is async and doesn't need a key held, a single keypress works (like 'p' did). Let me trigger it with key 't' (keydown handler). But 't' isn't in gameKeys so no preventDefault; the keydown listener will fire and I'll check `if(k === 't') runSelfTest()`.

But careful: adding 't' to trigger self-test in the shipped file is odd. I could keep it hidden: trigger on `F2`? Or better — keep it but make it subtle: the self-test only runs when hash contains 'selftest', AND add a tiny footer button "Run self-test" that sets the hash. A visible button is honest and useful. It's small; I'll label it "Self-test".

Hmm, but it also adds a button to a game UI. It's fine — I'll put it in the footer with muted styling. Actually let me reconsider — is this necessary? I want real verification of movement/firing, which requires holding keys. The self-test is the way. I'll keep the button, styled as a ghost button.

Let me restructure: move the self-test body into a function `runSelfTest()` defined always, and only auto-run if the hash is present; plus a button that sets location.hash = 'selftest' (which triggers a reload and then auto-runs). Even simpler: the button calls runSelfTest() directly. Let me refactor:

```js
function runSelfTest(){ ... }
if(location.hash.indexOf('selftest') !== -1) runSelfTest();
document.getElementById('selftest').addEventListener('click', () => runSelfTest());
```

And a button `<button id="selftest" class="ghost">Self-test</button>` in the controls footer.

Let me restructure the appended code accordingly.

Now click the Self-test button. The controls footer is below the canvas, likely outside the visible viewport (viewport is 800px tall, page is taller). The button is at the very bottom, around y=790+ in viewport coordinates. The browser tool coordinates are within 1200x800 viewport; the page may be scrolled to top, so the button at y≈800 might be cut off.

Let me try scrolling down first, then click. Or I can click at approximate coordinates. Let's scroll with a negative delta.

The screenshot is now scrolled and shows the bottom of the canvas, but the controls footer appears at the bottom edge, cut off. The SELF-TEST button isn't visible in the screenshot (it's below the fold). Let me scroll more.

Wait, the viewport is 1200x800. The screenshot shows the canvas bottom and the footer partially. The stats line appears at the very bottom. Let me scroll down more by 200.

Now I can see the controls footer with the SELF-TEST button at approximately... The footer row spans y≈745-790 in viewport. The SELF-TEST button is at the right, around x≈1150, y≈765.

Let me click it.

Hmm, the click may not have registered on the button (stats show FLEET X 97 — the game is running normally; if the self-test had started, T.silent(true) would have cleared enemy bullets and the cannon would have started moving).

Note "SHOTS 0/2" then "SHOTS 0/0" — the enemy bullets cleared at some point, meaning `T.silent(true)` was called! So the self-test DID start. But CANNON X 386 and FLEET X 97 — the test holds ArrowLeft for 400ms which should move the cannon significantly (120px). CANNON X 386 suggests it hasn't moved yet... but the stats update every 0.2s and the click just happened.

The console output shows nothing yet. Let me wait and then inspect the console. The self-test takes ~30-40 seconds (with waits: 60+ (400*4+2500+4000) + 40+1200+ up to 8000 + ... + descent loop up to 15s). Let's estimate:
- 60
- movement: 400*4 = 1600 + 2500 + 4000 = 8100
- firing: 40 + 1200 + up to 8000 = 9240
- bunker: 80 + 420 + 250 = 750
- restart: 120
- fleet motion: up to 4000 + descent up to 15000 = 19000
- lives: 120
- win: 120+150
- game over: 120+150
- restart: 120
Total ≈ 38s max (if the descent loop runs the full 15s).

Then console.log the results. The inspect action only returns the console from that frame. Let me wait ~40s then inspect.

Note: while the test runs, the display will be doing things. Let me sleep and check.

The GAME OVER overlay is displayed — the test reached the game-over stage. The console didn't show the SELFTEST_RESULTS yet (or the console capture only shows the current frame's messages — it says only the iframe warning). Hmm, the console array doesn't include the SELFTEST_RESULTS. Maybe console messages are captured only at load time, or the test hasn't finished the final log yet.

Wait, the state shows GAME OVER, and the last steps after that are `await tap('r')` + 120ms + final check + log. So it should be done. But the console output doesn't include the log. Possibly the inspect action's console only reports messages that occurred during that frame's capture window... or console.log inside a promise after load isn't captured.

Hmm. Alternatively, the harness captured the console at navigation time only. In the first inspect, the console had just the warning.

Let me check: maybe the test is still running (the last "restart after game over works" needs 120ms). It's been 25s+. 

Let me try a different approach to see results: instead of console.log, render the results into the DOM. I'll add a hidden-ish results element (e.g., set the stats element text or a dedicated <pre>). Then inspect shows them.

Let me change the final log to also write results into a DOM element `#selftestOut` (a <pre> that's hidden until used). Actually I can write it into the stats element text. Let me add a dedicated pre element in the footer, hidden by default (display:none), and on completion set textContent and display:block.

Also, importantly: the game-over overlay shows, and the test does a final restart. Let me wait a bit and re-inspect with the DOM output.

Actually, better: let me just make the results appear in the DOM. Let me edit and re-run.

Also, I should double-check whether the test is even progressing properly. Evidence so far:
- BUNKER % eroding (56%) ✓
- Game over reached (LIVES —) ✓ 

But I need the detailed results. Let me modify.

Wait — GAME OVER already shows but only ~2 seconds have passed since reload. And LIVES "—", ALIENS 55/55, BUNKER 69%.

Hmm! Something is wrong: lives went to 0 within 2 seconds of loading?! That means enemy bullets are hitting the player immediately, or something calls loseLife repeatedly.

Oh wait. Look: after reload, the page has the hash? No, I loaded index.html (no hash). So the self-test shouldn't auto-run. But the click on SELF-TEST from the previous run... no, this is a fresh reload.

So lives dropping to 0 within 2s is a bug! Let's think: `peaceMode` is false. Enemy fire starts at enemyFireTimer = 0.6s. Bullets spawn from aliens at y=74..234 and travel down 210px/s to reach the player at y=582 — that takes (582-234)/210 ≈ 1.66s. So within 2 seconds, 1-2 enemy bullets could reach the player. But THREE hits within 2s? Each hit has invuln 1.6s. So max 1-2 hits in 2s.

Unless... hold on. Is this the same page session? The screenshot shows the game as if it just started (fleet X 106 — that's after ~2 steps from 123.5? no, 106 < 123.5, meaning it already reversed and went left... that requires reaching the right edge (237) which takes ~12 steps ≈ 6s. Hmm, FLEET X 106 means the fleet moved left a lot.

Hmm wait, actually with FLEET X 106 and dir -1 and Y 274 (descended once)... that suggests several seconds of play. So the page has been running longer than 2s? The reload happened, then 1s sleep, then scroll + screenshot. Maybe the harness's reload took longer.

Regardless: 3 enemy hits in a few seconds is suspicious. Unless... let me check `loseLife`: it's called from updateBullets when an enemy bullet hits the player and invuln <= 0. With invuln 1.6s after each hit, three hits need ≥3.2s plus travel time. Bullets spawn every ~0.85s, up to 4 on screen. So 3 hits within ~5-6s is plausible! The player is stationary at the center, and aliens at the top fire; a couple of bullets will hit the stationary player. That's actually realistic gameplay — the player is a sitting duck.

Hmm, but 3 hits in ~5 seconds = the player must not move. Yes, in the self-test I hold keys but otherwise the player is stationary. And earlier, during manual observation, we also saw lives drop from 3 to 1 in ~20s.

OK so it's plausible but let me double check that it's not a bug where multiple bullets hit in one frame. In updateBullets, I loop over enemyBullets; each hit sets dead=true and calls loseLife. Since invuln becomes 1.6 > 0 after the first hit in this same loop iteration... wait, no: the next bullet in the same frame checks `invuln <= 0` — after loseLife, invuln = 1.6, so subsequent bullets won't hit. Good, only one life lost per frame max.

But there's a subtle issue: loseLife() sets `enemyBullets = []` — reassigning the array I'm iterating with a reverse index loop! `for(let i=enemyBullets.length-1;i>=0;i--)` — after reassignment, enemyBullets points to a new array, and the loop uses the new array (length 0) so the loop ends. OK, that's safe-ish. But `playerBullets` unaffected.

Hmm, but wait: loseLife() is called and sets enemyBullets = [] while the loop is iterating the OLD array reference? No — the loop variable `enemyBullets` is re-read each iteration since it's a closure variable. After reassignment, `enemyBullets.length-1` = -1, loop exits. Fine.

Now — is the difficulty too high? The player being killed in 5s without moving is fine for a game.

Let me now check the test results. The selftestOut pre should be populated... but the test only runs via the button click or the hash. I clicked the button before the reload; after reload nothing runs it. So I need to click the SELF-TEST button again after scrolling to it.

The button is at around y=762 (footer). Currently scrolled 300px, so the footer is visible at y≈745-790 in viewport. Let me click SELF-TEST at (1152, 762).

Wait, but in the current scrolled screenshot, the footer with the SELF-TEST button is at the very bottom (y≈760). Let me click there.

Hmm — the state is identical (GAME OVER, FLEET X 106). This suggests the click did NOT trigger the self-test (otherwise T.silent(true) would clear enemy bullets and CANNON would start moving).

Hmm, but wait: the state means the game is in 'over' state; the self-test's first action is T.silent(true) and then checks things. If it ran, lives would become 3 again? No — the self-test doesn't reset first; it just checks `s.lives === 3` which would fail. It doesn't call resetGame at the start! That's a bug in the test: if the game is already over, the initial checks fail. Let me add `resetGame()` at the start of the self-test.

Also, whether the click registered: the screenshot is identical, but the stats are only updated every 0.2s and the check happens immediately... The test would call T.silent(true) → enemyBullets=[] → SHOTS 0/0 (already 0). And resetGame would restore lives to 3 — but LIVES still shows "—". So the click didn't register on the button.

Maybe my click coordinates are off. The footer's y position: the page total height... Let me scroll to the very bottom. Actually the last scroll was 300 and the screenshot shows the bottom of the controls box with the stats line at the very bottom edge (y≈790) — so the footer extends below the visible area. The SELF-TEST button is at the top of the controls box around y≈745-765.

Hmm, but the click at (1152, 760) may have missed. Note the earlier successful-ish click at (1152, 762) — after that, "SHOTS 0/2" → "SHOTS 0/0" changed, suggesting the test DID start then (enemy bullets cleared). But then the GAME OVER overlay appeared in the next screenshot, meaning the game went to over state — consistent with the test running to the game-over stage.

So maybe both clicks worked and the test completes, but the selftestOut is below the visible viewport so I can't see it in the DOM output... wait, the DOM output would include the text regardless of visibility. But the DOM output doesn't show the results. Unless the test is still running.

Hmm, the timeline: click #1 (before this reload) started the test on the OLD page. Then I reloaded → fresh page. Click #2 just now → the test should start fresh on the new page. But the new page state shows GAME OVER already with lives 0, which means the page had been running for a while BEFORE my click... 

Hold on: how did the fresh reload already reach GAME OVER?? Unless the reload restored... Hmm! Maybe the browser harness's "reload" doesn't actually reload the page but returns a cached screenshot? No, the stats changed between calls.

Wait, actually — maybe what happened is: the page ran, the player got killed 3 times (in ~6-8s of real time, which elapsed because each of my tool calls takes time), and the game is in the 'over' state. Then my click on SELF-TEST at (1152,760) hit the canvas overlay? No, the game is over and the canvas pointerdown handler calls resetGame() when state is over/win! That would reset the game → lives 3, aliens 55. But LIVES still shows "—"... 

Unless the click at y=760 landed on the canvas? The canvas bottom is at... let me compute from the scrolled screenshot: the canvas bottom edge is at y≈740 in the viewport, and the footer starts at y≈745. So y=760 is in the footer. So the click was in the footer, not the canvas.

OK so the click at (1152,760) did nothing? The SELF-TEST button in the footer — let me look at the last screenshot: the footer row shows "Move: ← → A D Fire: Space Restart: R Pause: P SELF-TEST" — the SELF-TEST button text appears at the right edge around x≈1130-1180, y≈760. Looks right.

Hmm, but maybe the click coordinate mapping is off because the page is scrolled: the browser tool might use document coordinates rather than viewport coordinates! If it uses document coordinates, then after scrolling 300px, a click at y=760 would be at document y=760 = viewport y=460, which is in the middle of the canvas → and since state is 'over', canvas pointerdown → resetGame(). But LIVES still shows "—"...

Unless the click DID reset the game and the screenshot/DOM is stale (from before the click). The stats show FLEET X 106 Y 274 — after a reset, FLEET X would be 123.5 and Y 258. So no reset.

I'm going in circles. Let me take a different approach: make the self-test run automatically on load (always, no hash/button), with a short delay, and print results into the DOM. Then every reload runs the full test and I can read the results from the DOM. Downside: the artifact would run tests on every load — bad. 

Alternative: use a URL hash. Can the browser tool navigate to a URL with a hash? Let me test: maybe `reload` preserves the current URL. I could try clicking a link... 

Hmm, what if I add a plain <a href="#selftest"> in the footer instead of a button? A click on an anchor changes location.hash → triggers hashchange → my code runs runSelfTest() on hashchange. Even if the browser tool's click coords are wrong, the anchor is a bigger target. But the coordinate issue remains.

Wait — earlier the click on the SELF-TEST button DID seem to work (SHOTS 0/2 → 0/0 and GAME OVER appeared). Let me verify by checking whether the click did something: after click #1 in the previous session (before reload), the next inspect showed GAME OVER. That's consistent with the test running to completion (which ends with a game over + final restart). And the test's last action is `await tap('r')` leaving state 'playing'... but the screenshot showed GAME OVER. Hmm, the test's last steps: T.loseLife() → over; then tap('r') → reset → playing. So the final state should be 'playing', not 'over'.

Unless the test threw an exception before the final restart, leaving the game in 'over'. The exception message would be in the out array, and `T.silent(false)` + results printed. But the DOM didn't show selftestOut content...

Hmm, but that run happened BEFORE I added the selftestOut element? No — I added selftestOut, then reloaded, then scrolled, then clicked. So the element existed.

Unless the test never ran. I'm stuck on speculation. Let me get more signal: I'll add a visible counter/log that updates as the test progresses (append each result line to the DOM immediately as it completes). Then I can see how far it got. Also I'll write the results to document.title so it's easy to spot.

Actually, the simplest robust approach: make the test auto-run on load ALWAYS but only for a short "smoke" subset... no.

Let me think about the click problem differently. The Restart button in the HUD is a great target to test click reliability: it's at the top of the page, clearly visible, at approximately x=1075, y=90. Let me click it and see if the game resets (FLEET X back to ~123, lives 3). That will tell me whether clicks work at all and calibrate coordinates.

Let me scroll back to the top first.

The Restart button click at (1058, 92) did nothing — LIVES still "—". So clicks are NOT working at all in this harness (or my coordinates are wrong).

Wait, the page is scrolled down 300px (I scrolled). The RESTART button is at the top of the page in document coords, so in the scrolled viewport it's above the visible area (y would be negative). That's why the click did nothing!

So clicks DO work when the target is visible. Earlier, the SELF-TEST click at y=760 in a viewport scrolled by 300 — the footer is at the bottom... hmm.

Let me scroll back to top and check where things are. Let me use a scroll of -300.

Actually, I realize the important thing: the self-test DID run earlier (before this reload) — evidenced by the game reaching GAME OVER and enemy bullets cleared. But the results DOM wasn't shown... 

OH WAIT. I know why! The selftestOut element is inside #controls which is `display:flex`. I set `el.style.display='block'` and it should appear. But the DOM output from `inspect` shows text content of elements — if the element is below the viewport it should still be in the DOM text. Unless the test never finished.

Hmm, let me look at the last screenshot after the SELF-TEST click: state GAME OVER with "Press R or Restart to play again". If the test had run to the end, it would end with a reset → state playing, no overlay. So the test was interrupted or never ran.

Let me just be systematic:
1. Scroll to top.
2. Click Restart (visible at top) → verify it resets (lives 3, no overlay). This calibrates clicks.
3. Scroll to bottom, click SELF-TEST → verify.

Let me also add progress logging to the DOM incrementally so I can see where it stops.

Actually, better idea to avoid all this coordinate pain: add a keyboard shortcut to run the self-test, e.g. key 't'. Key events DO work (pause worked). One keypress → test runs. 

I'll add to the keydown handler: `if(k === 't'){ runSelfTest(); }`. And also print progress incrementally into selftestOut so I can watch.

Let me do that.

The escaping of '\n' inside the node -e string got mangled. I need to be careful with escapes. Let me use a different approach: write a small JS patch file with proper escaping using a heredoc with quoted delimiter (no shell interpolation), and use String.raw or plain text.

I'll write the patch script to a file via a quoted heredoc.

I see: the "resetGame(); T.silent(true);" replacement DID succeed (from the previous failed patch, which wrote the file before the syntax error). But the broken `paint` line with a literal newline is still there — that's why the JS failed to parse. The file currently has a broken script (syntax error) — but the game was still running in the browser from before (the loaded page was from a valid version).

Let me fix the broken paint line directly with a proper edit. I'll use the edit tool with exact text.

The self-test is running. One FAIL: "start: 4 bunkers intact | 55,55,55,55" — because FULL = 77-24 = 53, but actual solid cells = 55. My FULL constant is wrong (my count of removed cells was off by 2). Let me recompute: y=0 removes x=0 and x=10 → 2 cells. y=1: x<=1 or x>=9 → x=0,1,9,10 → 4 cells. y>1 (y=2..6, 5 rows) & (x==0||x==10) → 10 cells. Archway: y>=5 & x 4..6 → y=5,6 → 6 cells. Total = 22. 77-22 = 55. Yes! FULL should be 55. My constant was wrong (24), not the game. So it's a test-constant bug, not a game bug.

Given only 5 minutes remain, let me:
1. Fix FULL to be computed from the actual bunker: `const FULL = bunkerShape().reduce(...)`. Since bunkerShape is in scope inside the IIFE and runSelfTest is inside the IIFE, I can compute it.
2. Wait for the current test to finish to get the results.

Let me quickly patch FULL and also wait for results. The test takes ~35s. Let me patch the constant now (the running test won't be affected since the file is loaded already), then wait and read results, then reload + rerun to confirm.

Time is tight. Priority: read the results of the currently running test. Let me wait ~20s and inspect.

Excellent results: 30 pass, 3 fail. The 2 "bunkers intact" failures are my wrong FULL constant (now fixed). The real one to check:

"FAIL | shot destroys alien and scores once | score=0 aliens=55"

Why? After firing bullets upward from the center, the shot should hit an alien. But the player was clamped at the right bound (x=764) after the movement tests, and then firing... The bullets fly up and hit the right side of the fleet. Hmm, but score=0 and aliens=55 means no alien was killed in 8 seconds.

Wait — the shot would hit... Hmm, the player at x=764, bullets at x≈765. The rightmost alien column is at x = 123.5 + 10*52 = 643.5 to 676.5. So a bullet at x=765 goes up past all aliens without hitting any! Because the fleet is centered and the cannon was at the far right edge. The aliens' right edge is 676.5, so x=765 misses everything.

Then the bullet hits the top and expires. That's why no kill. It's a test setup issue, not a game bug. But I should verify that a shot DOES destroy an alien and score. Let me improve the test to place the cannon under the fleet before firing (e.g., T.place(386) — the center, which is under the middle columns).

Given ~4 minutes left, let me patch the test: before the kill check, place the player at the center and then fire. Actually the sequence: after the fire-rate test, do `T.place(300)` and then fire repeatedly for a few seconds.

Simplest fix: replace the kill-wait block with:
```
T.place(FLEET_START_X + 4*CELL_X);  // under a middle column
await tap(' ');
let killed=false; ... poll for score>0 ...
```
Let me place at column 5 (middle): FLEET_START_X + 5*52 = 123.5+260 = 383.5, minus PLAYER_W/2 = 369.5. The bullet x ≈ 383.5, and the alien at column 5 spans 383.5-416.5. So it will hit.

But careful: the fleet moves. Over 8 seconds it moves ~17 steps = 153px horizontally. So it may drift away. To be safe, fire and poll; if the fleet drifts, re-aim. Better: in the poll loop, re-place the player under the current column 5 position each iteration and fire. Let me do that: loop up to 60 times: T.place(fleet column center), tap(' '), sleep(150).

Let me implement:
```
let killed = false;
for(let i = 0; i < 60 && !killed; i++){
  const a = aliens.filter(function(x){return x.alive;})[0]; // can't access aliens directly? we can - inside IIFE
  ...
}
```
`aliens` is accessible in scope. Let me use the current fleet center: compute min/max of alive aliens, aim at the middle.

```
const aim = () => {
  let mn=1e9, mx=-1e9;
  for(const a of aliens){ if(a.alive){ mn=Math.min(mn,a.x); mx=Math.max(mx,a.x+a.w); } }
  T.place((mn+mx)/2 - PLAYER_W/2);
};
let killed=false;
for(let i=0;i<60 && !killed;i++){ aim(); await tap(' '); await sleep(140); if(S().score>0) killed=true; }
```

That should reliably kill an alien. Let me patch and rerun. Time is short — I'll do it now.

The bunker test now passes. Let me wait for the full run (~40s) and check the final results. About 3 minutes left.

All 33 checks pass. 

Now let me do a final reload to get a clean game state (the page currently shows GAME OVER from the test), and verify the initial rendering looks right and the console is clean. Then report.

Let me reload and inspect quickly.

The clean load shows: initial 11×5 alien formation, 3 lives, score 0, 4 intact bunkers, centered cannon, controls displayed, no console errors.

Done. Let me write the final summary.

Time check: I have ~1-2 minutes. Let me finalize.