I used to love playing Galaxian in the arcade. I thought, is AI good enough to one-shot this using just html, css and js? The answer is yes. I built the original using Google Gemini 2.5 Pro in <1 min as a self-contained html file. This current version was built with Claude Opus 4.6 in Google's Antigravity IDE and it's vast improvement with sound effects and mouse controls.