What I came up with was a Dance Dance Revolution clone, that spawns zombies as you dance. A girl game, for boys:
Anyway, it's very rough around the edges, but the total build time was about eight hours so I think I did OK. It completely sucks as a game, but it was a ton of fun to make (and I learned a whole lot, and that's what it's about, right?)
Click here to play: Down, Left, Right of the Living Dead!
(Oh, and: a massive thanks to OELAV for hooking me up with the awesome 8-bit tune, and to Donna who made this awesome little thing out of beads that I turned into a screen zombie)