Gravity Defied, the old fashion motorbike game, rebuilt with pure Ruby physics

Remember Gravity Defied, the motorbike game from old Nokia phones? I rebuilt it on DragonRuby GTK with the physics written in pure Ruby: no physics engine, just six point masses joined by springs and 16.16 fixed-point math. Thanks to WebAssembly, you can play it right in the browser with all 30 original tracks. Since every run is deterministic, a small beam-search bot finds clean runs offline, and the game replays them frame for frame