A cross between Spore and Fantastic Contraption
Incredipede, a "game about life and feet," is on sale for $4.99 on Steam for PC and Mac. If you are a lucky Linux user, you can download it for free. The game was successfully added to Steam via Greenlight earlier this year, and it looks like a lot of fun to play.
This sale runs until June 24, so jump on it if you want to save some cash and add another indie title to your collection.