-I don't like the theme, but it seems good for a mobile game.
-After running out of boost, you still get the audio of it when pressing the button. It should either not play any sound, or play a different one.
-Rolling feels off. I think it is not moving enough for its rotation speed. And in general, I don't know why it's so slow. The obstacles so far are about flying anyways, so making the roll option so slow just feels a little antagonistic.
-On level 24, I noticed one of the background trees was being phased out, which I'm pretty sure is unintentional.
For the type of game it is, I had a good time. Easy levels, with a bit of challenge if you want to get 3 stars. Main gripe is roll speed, and for some of the later levels you have to wait a while if you want to get the right cycle to 3 star.