This was a great idea. The puzzles were well designed as well. I loved how at times you would have to place keys while you were still jumping XD. The pixel art was damn good as well. The sound effects were cool too. You could probably expand on this with another key for attacking and having enemies and one more key to use for a platform. I honestly didn't have any real qualms with this game. I suppose the music could be a little sparse but that's just nitpicking from me. Great game overall :)