Overall, pretty fun! The level designs are quite clever and you do a good job of getting everything out of this concept that you can.
One critcism I have is that the push seemed to be a little too zealous to move. A couple time I pushed the CTRL button into the box and then accidentally pushed it a square more and then had to start the whole level. This happened often enough that it was pretty frustrating. Also what's the point of the go back a level button lol? I pressed that just to see what it did, realized there was no "go forward a level" button and quit because I didn't want to play the same level over again.