Thursday - Nearly playable

Close to having a minimal working game now. Can start/stop the accelerator, discover particles, and advance levels. Most sound effects are done.

Minimum remaining to have a submittable entry: Level restart button, fix the starting pipe in place, detect when end of game is reached, create some help screens.

Nice to have if there's time: More pipe types, a way to buy a chosen pipe, detector display, liquid helium tanks, particle detectors, obstacles.