Really cool game! First off, amazing pixel art... but I'd expect no less from you! The SFX and music are all well chosen, and the game packs a lot of atmosphere and charm.
The mechanic feels very unique. I'm not sure if this is something that's been done before, but haven't played anything quite like it. The built in tutorial works very well, and the difficulty ramps up at a good pace.
Unfortunately, I'm not super good at it... I got stuck on the room with the 3 angled bouncers. I couldn't get the right rhythm going to get up and keep the crystal alive. (Playing at 1am may not be helping either, lol... I'll give it another shot later)
Great work as always!