Ayyy really nice!
I really, REALLY like the 2D character on 3D ambient you've made; really really nice.
The gameplay was simple and nice although learning it was pretty tricky - if you don't notice the block falling on the other at the beginning you can get kinda stuck, which I did. Also, kinda weird that there's a button to push the cubes rather than to pick up/down the cubes.
These issues aside, I really liked everything else - the music, the sound, the graphics, all very solid. Nice job!