Awesome!
Really, really enjoyed playing this. A little disconcerting first - might be worth making a note that the camera will carry on at it's one pace, regardless of what the bike does (this being part of the challenge); it wasn't immediately obvious.
The games handles very well, and while on the surface graphically simple, the patterns you can make are a nice touch, combining to make a game that's fun and challenging in an almost perfect balance.