Awesome!
Simple concept, easy to learn, hard to master. I loved it, the music was chill (which is perfect for this sort of game), nice levels, nice backgrounds. I don't have much to complain about haha.
Those saying lv. 14 has a glitch, I think that's the one you have to rotate the moment the level starts; if you wait at all, the balls grab in the middle and you have to restart. It's a bit annoying when levels do that, but all the same, that's just part of the progression of difficulty (and not terribly unusual). I got to lv. 19, no obvious glitches.