Pretty cool entry!
Nice work on the 3D animations and level design. Also good job implementing the size changes, the block pushing and the blowing fans :) I can imagine many more levels with just these basic mechanics.
There was no music after the intro, then again after a couple levels, then no more (might be a bug, might be my slow internet...)
When it was there it was really catchy and fitting with the game!
Some sound effects would be nice, and a more fluid movement as well, but all in all, great job!