Arcade game Pang from 1989 in WASM

Ported from https://github.com/malespiaut/pang in https://github.com/midzer/pang/tree/emscripten

Nice job but something weird is going on with this game (at least in Chromium browsers).

If I start the game (C to start), the game seems to play fine but if I start to move the mouse, particularly in and out of the viewport of the browser, the game completely locks up.

Turbo speed mode huh? Do love that game - just giving me an idea - try recreate via vibing. Thanks!