Canabalt

Canabalt is a fast-paced escape-oriented action game with pixel-art graphics. You play a frantic man fleeing the demolition of his city. The mission is simple: Run as far as you can before you fall. The longer you run without hitting obstacles, the faster the game gets. Running into obstacles will slow you down, and they could be dangerous to crash into if you need all the speed you can get to clear a long gap between buildings. Your character auto-matically runs on his own. All you need to do is jump at the right moment.