One key rhythm runner

1 test · 2 finished runs (2 agent, 0 raw one-shot) · 2 live demos

The prompt

Build a complete single-file browser game (index.html, plain JavaScript and Canvas or Three.js from a CDN, no build step) controlled by ONE key only (Space, or tap on touch). One mechanic, deep execution: a neon runner on a looping track where pressing jumps, holding glides, and releasing on the beat gives a perfect-timing bonus. Procedurally generated levels that ramp difficulty, a synthesized WebAudio soundtrack whose beat the obstacles follow, particle effects on perfect hits, combo counter, score, best score in localStorage, and a game-over screen with instant restart. IDLE AUTO-PLAY: if no key is pressed for 3 seconds on the title screen, an AI demo player plays the game with near-perfect timing (and an occasional miss) so a headless capture shows real gameplay. Must render with Canvas 2D or WebGL (no WebGPU). Save the main page as index.html in the current directory (plus any local asset files you create), with no build step. You may serve it locally and open it in headless chromium (/usr/bin/chromium, software WebGL, no GPU, no WebGPU) to screenshot and inspect your own output, and iterate on your own before finishing. Close any browser you open as soon as you've taken your screenshot. Finish with a short README.md describing the controls.