Cute little game, the few puzzles were nice and you can see the potential for more complex puzzles using the current mechanics. Not sure why you need to press E to move the boxes, seems like the mechanic would have worked just fine with just pushing the box without pressing E. I'm guessing you had more mechanics planned for the box that would require an interact button, but either way you get used to it.
Only real complaint is that you could have done more with the loop theme, the only similarity between the rooms is the goal of getting past the door and the square shape.