I'm a little late joining, so am going to try to throw together something this weekend (so about 48-72 hours). It was incredibly difficult narrowing down to a single choice, but ultimately selected Gangan! Junkland Dash from the 2013 exhibit by Illustrator Zac Zedica. The game's description (translated from Japanese):
2XXX year. Junkland suffers from enemies. The King of the enemy army boss and the gangs led by him occupy the junk land and it becomes a battlefield. To get Junkland back, residents, stand up! Modify the car, wear weapons, fight!
My plan is to do a 2D top-down driver/shooter a-la the old Spy Hunter arcade game. I'm going to make it a procedural generated, endless runner though instead of having to design levels. Hopefully this will keep the scope manageable within the tight window. Will hopefully have a rough prototype put together after lunch. Time to crunch!