Not too shabby: felt fun to hit the slopes and build up a big combo (though I do wish there was a clock or something to show you how long you have to do a move to keep your combo up). Menu is a bit drab and confusing though, and the game does get boring pretty quickly, especially due to the small amount of tricks, small amount of variation in obstacles, and the endless random generation. I'd end up killing myself intentionally just so I could get back to the shop! Maybe consider, instead of randomly generating mountains, hand-crafting a few mountains as levels with a start and finish to them. That way, people could ride down the mountains and try to create a best combo route for maximum points, which you could store in high score tables for people to compete.
Oh, there was also a funny glitch: I found that you will grind on a rail no matter what, even if you are completely upside down in the middle of a flip (it'll just automatically insta-adjust you). Feels like that shouldn't be possible, haha!