Really good game. Did find a few bugs in it though, that I will share both so you can fix them in the future, and because I couldn't really find anything else to say since it is just a good game. First, you can walk into a corner to clip out of the map. Secondly, you can place the box in a wall, and depending on where you do it, it can either get lost forever or launch you. Finally, you can carry the boxes through level transitions, to cheat later levels. Great work.