Really fun! I agree with the earlier comment about wanting more drifting. Overall this is wonderful -- awesome control scheme! Works better than most other browser games I've played!
Nice graphics, pretty smooth, biggest suggestion: Needs way more driftiness -- Right now it feels like the boat is "on rails" in that it follows the steering pretty closely. You should try tweaking the physics so the boat retains much more of its velocity, could be a lot of fun!