This is a great little puzzle game. I think you did a really good job on the level design, they were challenging enough to be engaging but not too difficult so it encouraged me to keep retrying. The controls were responsive and intuitive (though a bit mind-bending at first!). My only real feedback is that for a game that only uses the keyboard for controls it would be nice to add a restart button like 'R' or just have the level restart automatically so I don't have to reach over for the mouse. Very good submission!