I wanted to record myself playing the game with some commentary, but the game kept freezing for me (linux build by the way)
the best I can give you is:
as for the movement when I was able to play, I must say the surfing did not feel good, especially the turning felt like I was turning around some point on the map, and not my characters up axis.
I think locking the camera is not good. I wanted to say you should check out how camera works in SSX games, but in those games you mostly just go downhill. Good luck with future demos.