I liked the music, and the art was good, although a little sparse at parts. Some of the controls were a bit weird, like the double jumping, and climbing walls by standing next to them. Also, is the box supposed to be moving itself? I thought we were supposed to push it based on the description.
I also got bored after a few minutes of following the box, so I might not have made it to the end. Maybe make it a bit shorter? Besides that, I thought it was good.