It's cool. Simple, but fun. I want to do wheelies though, and have a better incentive to play. Like race against opposition or beat the clock, or collect things (see cyclomaniacs etc).
It's a neat concept, it doesn't even matter that there is no explanation because it adds to the ambiance/concept of the game. I like that it is oldskool. I don't understand why the screen is so small though??
Nicely put together for a simple jigsaw game. Needs more fun and functionality to stand out though. Congratulations message at end of level should be above the puzzle.