It must have been frustrating spending time on the artwork you barely see! It looks great. Even when you can't see anything, the artwork still shines.
But I'm stuck on the third level! How do I clear that void?
I think maybe it'd work better if you only see the level after completing it? I did start memorising the level after dying rather than using the rocks. The rocks are a fantastic feature though, love it.
My only problem would be: Is seeing the game really a mechanic of a platformer? I guess the results are the same though - you've removed a core component and made it in to something interesting.
Really cool, i want to play more!