WOW, this game is soo good !
It really respect the theme of this jam.
It lacks some animation for the character but the idea is well composed.

The control scheme is not good, Arrow Keys + Jump + Mouse is just not usable while playing. I was very frustrated with that.

I'm not sure the last level is beatable, I collected a bunch of the green gems but the game never ends, and eventually there ends up being far too many projectiles... so that was frustrating.

I think you need to shorten your iteration times, rather then kicking me back to the main menu, just restart the level upon death. It would make it much less frustrating to play.