A game and some progress.

So, a game does finally exist and works, but it's just a basic squash. It yielded an actual bug, a dumb one. The sound channels have a queue of sound events, you can queue up to 32 sounds or slides. These go in the tail of the queue, and are popped from the head of the queue. Unfortunately the head of the queue wasn't wrapping round (careless), so on the 32nd beep the sound stopped working.

It also now runs in Javascript. Quite well, seemingly, though I don't know how it works on a slower PC yet. Anyway, you can run the Javascript port here.