Very beautiful and a pretty neat idea. The sound effects were also quite nice, but I really miss a save function or some checkpoints. I kept dying an had to restart the game. Maybe there are checkpoints later on in the game, I don't know... I didn't come far...

A control guide would also be nice. Not necessarily in the game, but here on the site. It took me a while to find out how to change the camera.

But hey, nice work! It looks awesome and it's a cool idea!