The core mechanic has great potential, its versatile and fun to use. The game is pretty buggy, more direct control over the yo-yo would make this so much better and some tighter collisions are needed urgently. The level design is not too bad, once you get the hand on the controls they flow pretty well without being too easy.
Theme, you only have a Yo-yo, im on the fence about this, on one side it fits the theme, on the other is like saying "we only have one mechanic" and call it a day theme wise.
Originality in spades, the game shows untammed creativity, if the devs hone their skills more they could get pretty far making games and i hope to see more from them.