Looks cool, nobody seems to make these straightforward stunt games anymore, sad really, I remember playing them a lot as a kid. Personally I don't like the modern ones with checkpoints and OTT replay features.
Don't mean to babble, but I think the aim should always be to perform a stunt perfectly, like going for a high score - that way people tend to replay challenges a lot more. I mean, if you had a simple pass or fail, or gold silver bronze system, then people would get gold then go onto the next challenge, but if you had a medal system plus an online scoring system with a leaderboard, then it could be very popular.