I really liked the vibe of the game ! Uforutnately, I had some game breaking bugs: I found myself in places I wasn't able to jump anymore (mostly the place of the left bottom item) :/
I funny to see that we went with a similar ideas for our games ^^
The art is really wonderfull, and the animation of your character is very smooth. The music fits very well in here too !
The box mechanic was a nice touch for your game. It really added some diversity in the game play !
Nice job !