Very good, but the controls are somewhat confusing in the beginning, as almost every movement also pushes the avatar (which isn't the case for the later levels).
I think if you'd add just one simple puzzle in the beginning where the walls are not enclosing the avatar (and thus it's more obvious that you're piloting the walls), it would be immediately more intuitive from the beginning.
Other than that, great presentation, puzzles (really good balance imo) as well as a lot of levels for only 48 hrs.
Great stuff, good work!