Space Invaders · deepseek-v4.1-flash

Let me build the game. I'll write index.html with a canvas-based Space Invaders game.

Let me write comprehensive code.

Let me review a bug: in update, I defined `dir2` function after using it in a loop. Function declarations are hoisted within the function scope, so `dir2()` works. Fine. But `state.alienSpeed` movement and edge handling: I move then check. On edge hit I set dropPending, so next frame all move down. OK.

But there's a subtle issue: when hitEdge, after snapping I set dropPending true. Next frame, we drop down but don't move horizontally. That's fine.

Let me load in browser.

The game looks good. Let me start the game and test. Click START. The overlay button. Coordinates: canvas at roughly x=278..920, y=128..688 in 1200x800. Button center around (600, 452).

Game started. Wave banner "WAVE 1" showed. Player at bottom. Aliens moving. Now test firing and movement. Let me press Right arrow a few times and Space.

Let me use key actions.

Interesting - the player shot appears at left (x~455) but player is at center. The shot was fired before moving? Actually the shot visible at left is an enemy shot (red/pink), descending. Enemy shots are pink. Yes at (455, 655) there's a pink shot. Bunker 3 (at ~630-730) has a chip at top. Player moved right slightly. Good.

Wait, the two ArrowRight presses moved player right a little. Good.

Now let me fire with space. But note keydown handler calls tryFire when space pressed. Let me press space multiple times.

Actually let me check the game state programmatically via inspect. Let me use the browser inspect with evaluate? The tools don't have evaluate. Only inspect. Hmm. But I can use bash? No, browser is the interface. I'll rely on screenshots.

Let me press Space and observe shot appears. Also test bunker damage by firing and waiting.

Player is at center ~600. Bunker at 630-730 and 440-540. Player shot goes up at x=600, which is between bunkers (gap 540-630). Hmm, so shot goes through gap. To hit a bunker need to move to align. Let me move player left a bit and fire, then check bunker damage.

Actually initial player at center x = (640-40)/2=300 canvas coords. Canvas starts at display x=280, scale 1. So screen player x ~580. Bunkers canvas ox: spacing=(640-384)/5=51.2. b0 ox=51.2..147.2 → screen 331-427. b1 ox=51.2+96+51.2=198.4..294.4 → screen 478-574. b2=345.6..441.6 → 625-721. b3=492.8..588.8 → 772-869. Yes screenshot matches.

Player center screen ~600, between b1 and b2 gap (574-625). So shoots through gap. Good design but for testing bunker, move left to align with b1.

Let me press ArrowLeft then Space.

Lives went to 2 - enemy shot hit the player. That confirms lives loss works. The player shot visible at top of player going up. Wait in second screenshot, the player shot is at (600, 615) just above player. It's between bunkers again (gap). Hmm I pressed ArrowLeft once but key events might be instantaneous press only (keydown+keyup). One press moves player for one frame ~ tiny. The player moved left very little. Hard to align.

The game is working. Let me test bunker damage. I'll move player far left using multiple presses? Each key action sends keydown and keyup presumably. Actually the browser key action likely sends keydown then keyup quickly, so movement per press is tiny. To persistently move, I'd need hold. The tool has drag but not hold key. Hmm.

Alternatively, I can observe alien shots hitting bunkers (bunker 2 already has a notch at top from earlier enemy shot). Yes in the screenshots, bunker b1 (2nd) top has a notch, and b2 (3rd) has a notch. That confirms bunker damage from enemy shots and persistent gaps.

To test player shot hitting alien: aim. Player is at center gap, aliens are directly above. Actually player shot goes straight up at x≈600. Looking at alien grid: columns at various x. The shot at x=600 might pass through a gap between columns? Alien grid width = 9*34+8*14=306+112=418. startX=(640-418)/2=111. Columns at canvas x=111+c*48. c: 0→111,1→159,2→207,3→255,4→303,5→351,6→399,7→447,8→495. Plus width 34. So alien centers at 128,176,224,272,320,368,416,464,512. Player center at 320 (canvas). That aligns with column 4! Good. So firing straight up should hit aliens. 

Wait player center canvas = x+20. Initially 300+20=320. Yes aligns with col 4 center. Screenshot showed shot around screen x 600 = canvas 320. Good.

So let me just fire and wait for score. Let me press space and wait.

Actually the lives already 2. Let's fire several times. Space per press fires once. Let me press space and then screenshot after a moment. But enemy will keep hitting player. Player invuln 2s after hit. Let's fire several.

Actually I can better test by moving with held key via dispatching many keydowns? The browser tool "key" maybe sends full press. Let me try pressing space multiple times in parallel and see score.

Score is now 10. An alien was removed from the bottom row col 4 (gap visible in bottom row). Score 10 confirms alien removal and scoring once. 

Now test Restart. Click RESTART button at screen (860, 716). Check lives/score/wave reset and formation/bunkers restored.

Restart works: score 0, lives 3, wave 1, full formation (all 45 aliens), bunkers fully restored, player centered. 

Now check console for errors — only the sandbox warning, no JS errors. 

One thing to verify: the `ovBtn.onclick` override for next wave. In startGame, I don't reset ovBtn.onclick, which could linger after a wave. But game only has 3 waves. Actually after nextWaveAndRun, ovBtn.onclick is set to null inside the handler. But `ovBtn.onclick = function(){ ovBtn.onclick = null; nextWaveAndRun(); }`. Setting to null inside means after first invocation it's null. But the addEventListener handler is still attached, which calls startGame(true) only if !running||gameOver||won. During next wave, running=true so it's a no-op. Good.

But wait: win() sets state.won=true then if wave<3 shows overlay and sets onclick. The addEventListener on ovBtn also fires on click. Order: addEventListener handlers registered first, then onclick property handler. Actually onclick is invoked as part of event listeners in registration order? The property handler is effectively a listener registered at assignment time. Since addEventListener registered at load, and onclick assigned later, addEventListener fires first. At that point state.won is true, so it calls startGame(true) — resetting the whole game! Then onclick handler fires nextWaveAndRun, calling nextWave on the freshly reset state. That's a bug: clicking "NEXT WAVE" would reset score to 0 and wave to 1 then nextWave makes wave 2. Loses progress.

Let me fix win/next wave flow. Better: make ovBtn a single handler that decides based on a mode variable.

Let me refactor: introduce state.overlayAction = 'start' | 'nextwave'. ovBtn click handler:
```
ovBtn.addEventListener('click', function(){
  if (state.overlayAction === 'nextwave') { nextWaveAndRun(); return; }
  if (!state.running || state.gameOver || state.won) startGame(true);
});
```
And remove the onclick override. Set overlayAction in showOverlay.

Let me implement.

Also check: startGame uses prev variable unused partly. Fine.

Another issue: `loseAllLives` triggers game over when aliens reach player zone. Good.

Projectile lifetime and fire rate bounded. Good.

Let me make the fix.

Also the keyboard handler for starting: when overlay visible and space/enter pressed. During nextwave, state.won is true so it would ovBtn.click() which now handles nextwave. Good.

Wait condition: `if ((e.key === " " || e.key === "Enter") && overlay not hidden)`. It checks `if (state && (state.gameOver || state.won) || !state.running) ovBtn.click();`. Operator precedence fine. During nextwave overlay, state.won true → click → nextwave. Good.

Now there's a potential issue: when win overlay for final victory, action='start' default. Good.

Let me reload and do a quick sanity check. Also I want to test win flow maybe hard. I'll trust it.

Let me reload and verify no errors and restart still works.

No errors. Game initial state correct. I'm confident. Let me verify restart button also starts game from READY overlay (it does via startGame). That was already tested after first game.

One more check: the win state. Hard to reach in remaining time. I'll note as unverified.

Final file is saved. Let me provide report.