At first I was like "what is this game, what I have to do?" I almost lost hope to discover what it is about. And then I've discovered that you can press R, G and B to do something with those crystals. Please add clear description that these are buttons, it's unclear otherwise!
I've completed the game, but I have no idea what I was doing :) Also inverted rotation added some difficulty, but when I figured out that you can ram cavern wall, clear the room and then ram another wall, rinse and repeat.