Really like the concept, implementation isn't best, but good for a first game.
Make it so that the boxes bounce back from the vertical walls. Also, they should explode at the bottom imo.
Hey, thanks for asking :)
It's not fully finished yet, needs a few bugfixes so I didn't get a rating just yet.. Will be the first thesis in AS3.0 so I hope they won't be too hard hehe, all the rest used AS2.0