"Improv" is the new Ludum Dare game by Matthew Gatland, and it is one of the most impressive 48 hour solo efforts I have ever played.

The game is a bit hard to describe in words. I found it sort of like a highly abstract, minimalistic Mirror's Edge, but not really. I wont tell you how to play it, it is probably best if you work out how to play on your own. The game only takes 5-10 minutes to finish, but it is time well spent.

Improv can be downloaded from the official Ludum Dare site.