Late to this thread, shipped my entry yesterday so heres the actual stack.
Code: Claude designs and writes everything, Claude Code implements and deploys. Two AI pipeline, one describes, one builds.
Art: nothing generated, all drawn by code on canvas
Music + SFX: also generated by code, pure math rendered to WAV when the round starts. No Suno, the game composes its own 60 second track
Engine: none. Vite + react + one canvas
Entry is Chargo if you want to hear what a math bassline sounds like. Theme fit was pure luck, the game was already about holding a charge