Really hard to find anything wrong with this. It feels absolutely perfect for what it is.
If I may offer some feedback, I have two quick notes:
- I think a natural temptation for the player is to try to interact with the geometry. Smoothing out the collisions could help this feel more like calmly surfing on waves instead of bumping into solid poles (if that makes sense).
- It would be awesome if each area was endless, so that you could keep going in one direction indefinitely and never reach the invisible wall at the edge of the level. If you ever plan to do more with this concept I think this would be a huge improvement to round out the experience.
In any case, great job with this. Definitely a stand-out of the jam.