Interesting, and looks promising, but isn't there yet.
* I managed to hop myself completely out of the track - I got flipped upside down, hit space to right myself, landed on another racer and bounced out of the track entirely. At that point, I couldn't get back on the track (although I got myself up to some pretty fast speeds!)
* It's way too easy to get stuck on the wall. If I hit the wall at an angle such that I'm pretty much perpendicular to it, I can't get off without stopping and backing away. This is bad. I should be able to just turn myself and slide off - after all, the racers aren't *square*