Really cool controls - it took a little bit of time to get used to it, but havent seen such controls anywhere and felt fun to roll with the momentum of the ball! The boss level was very difficult, could not get through after many tries! Adding a level before that for the player to get used to the controls and dodging etc. would work well.
Otherwise, the art was good and I liked the first background track. The second one was a bit jarring haha, just could be a matter of taste though :D
Well done on the entry :)