nice use of theme with the whole only your mirrored version can interact. Ran into what might be an issue, could't jump over the wall in the platforming room with the block... manage to push the block into the mirror and take it out from the other side. Couldn't figure out the intended solution for room 3? were it appears that you need to set blocks on both switches... however it seems to not have enough blocks.
There is a bug when jumping over the mirror where you hit the box, you can fix this by not looking at the mirror. I am planning on fixing this soon. As for there not being enough blocks, you might want to backtrack and think where you can use the blocks other than with the buttons.