ARCADE BENCHMARK 06: Bubble Brawl. Build a complete playable browser arcade game as one self-contained index.html using Three.js. In a small arena, trap wandering enemies in bubbles, then pop them before escape. The main score system must reward intentionally gathering enemies and creating visible chain reactions. Escalate with distinct enemy behaviours rather than simple speed increases. Include keyboard and touch-friendly controls, score, biggest chain, limited health or equivalent fail state, high-score display, and instant restart. Submit the final index.html only, not a mockup or explanation. It must run in a modern browser with no build step. Full design reference: https://gist.github.com/ponderingdemocritus/cf2b3f3933cadd06af9fe0e0c5aeabdd#file-index-html