Very hard puzzles, but I like it! I stuck around to solve all the levels and it felt quite rewarding, maybe boost that emotion with a final screen? Other than that: in the beginning you get shown quite a lot of information within a few levels, which is fine, but I think that changing the player charakter on top of that just adds confusion without too much benefit. Maybe adding such story telling elements would be more appropriate in a fully fleshed out game, which i could see this becomming. Very cool!