Very cool game (played with a PS4 controller for added lolz) and a good use of the theme. Absolutely love the chalkboard aesthetics of it all and the straight-forward approach which gives a challenging yet rewarding experience from the minute you pick it up.
The only thing i would have wished for would have been more visual effects when you manage to keep the combo going and maybe make use of the vibraton/motion sensors of the controller? (or maybe i didn't get to that stage?)
All in all, fun idea and very original!