Really loved the animations on this one. The main character's different poses when they're speeding up/slowing down/jumping/doing tricks were top notch!
Unfortunately I'll echo some other comments here about the jumping - it's very difficult to pull it off properly, and there's not a lot of feedback to tell me why I did or didn't succeed on doing one of the huge wave jumps. Additionally, the small jump (with the spacebar) is so short and quick that it gives very little time to clear the obstacles in your way. The large black birds required almost a frame-perfect jump on my machine anyway.
That being said, there's a lot of charm here, and a really cool mechanics with getting a high enough surf score to get past each level, so great job on that front!