I liked the artwork on the levels, the UI didn't quite match. This was a decent concept and I thought it was well designed with early easier levels getting progressively harder.
A few glitches where the character got stuck on the left side of the screen were annoying and the movement in general felt too slow to me. I'm with evilc00kie that the box was hard to control and move around.
But nice effort especially you fellow first-timers!