Taken off of my overnight scratch game, CliffRunner(http://midnight-steel.com/CliffRunner.html), Sprinter is a complete remake of that game, which will be expanded to form a more addicting and purposeful game, along with a few beauty touches (double buffering at the least, if you will). The goal of the game is simple: to survive as long as possible, collecting stars and dodging obstacles to gain levels. As you collect more stars, the current level will advance. The higher the level, the more difficult obstacles you will face.

Update: The goal of this game is to no longer be made in 7 days, but to be made on a robust, reusable base which can even be easily converted to 3d. This OOP is based off of this article (and many other influences): http://www.devmaster.net/articles/oo-game-design/