That was a nice game =)
Obviously, having to spam a button to move is very tiring on the long run, but I'm far from the only one who said it.
So, apart form that, I would say that my biggest complain was that it wasn't clear from the start that we could push boxes, and only the ones with the same size as you. A little tutorial room would have been perfect at the start.
The visuals are good, the game feels pretty relaxing and I liked the idea of the size limiting or opening paths!
Good job! =)