Made by Erik Onarheim. Released under the BSD-2-Clause license — original source.

Changes for this platform: Removed the Google Fonts 'Material Symbols' stylesheet link (the only network call in the game) and replaced the mute button's icon-font glyphs with plain emoji text; stripped the og:/twitter: social meta tags and <link rel=canonical> that pointed at the original excaliburjs.com hosting and the matching unused res/ex-social.jpg + res/new-social.pdn art files. Removed the dead `LevelMusic1` resource ('Level 3.wav' from the Juhani Junkala pack, 14MB, over the platform's 8MB/file cap): it was loaded by the asset loader in upstream but never actually .play()'d anywhere, so the whole unused 48MB Juhani Junkala folder was dropped (verified with ffmpeg-static, since no system ffmpeg was present, that it does transcode cleanly to a 1.5MB OGG, in case it's ever wired back up). The two tracks that ARE played (res/gba1complete.mp3, res/two_left_socks.ogg, each ~3:15 and looped) were re-encoded to their first 45s with a 2s fade-out: decoding ~6.5 combined minutes of audio via AudioContext.decodeAudioData measured a real 7+ second stall before any content was interactive, which fails the platform's automated check's short scripted-play window and is bad UX generally; trimming cut that to ~1.5-2s load time and incidentally shrank both files 85%+. Set `suppressPlayButton: true` on the Engine (an official Excalibur option) to skip its own separate built-in 'Play game' click gate, which was stacking a second click-to-start screen in front of this game's own title screen and left ArcadeSDK.ready() uncalled within any reasonable test window. Called `game.useCanvas2DFallback()` since Excalibur's WebGL2 context isn't created with preserveDrawingBuffer, so any out-of-band canvas readback (screenshot diffing, cover-art capture) could see a blank buffer despite the game drawing fine on screen; this is a plain 2D sprite+text game, so Canvas2D has no visual cost. De-linked credits.html's external attribution links to plain text and dropped its Juhani Junkala credit line to match what's shipped; also noted the font it actually credits (NotJamSlabSerif11) is never @font-face'd anywhere — only NotJamSlab14.ttf, from the same CC0 'Not Jam' family, is used, so credits.html and CREDITS.md now name that file. Added a CSS reset for full-viewport fill on phones and locked the viewport meta against pinch-zoom. Added arcade-bridge.js for ArcadeSDK ready()/score()/gameOver()/onPause()/onResume() integration (pause via engine.clock.stop()/start() plus KeyP/Escape and a translucent overlay; KeyM mutes via the existing <audio-menu> element) backed by three one-line `window.__tt...()` call-outs in turn-manager.ts's three end-of-run branches and in main.ts. Progress (furthest level cleared) persists through ArcadeSDK.storage and resumes play at the right level on a later visit instead of replaying the tutorial every time. Score = levels cleared (0-3); gameOver fires with won:true on clearing level3 (the whole 3-level campaign), won:false on any level loss or turn-limit draw, since the game always lets you retry that level immediately after.