I didn't like the control scheme at all, and the controls were given very quickly and with little explanation. Personally, I would have made it so you could rotate the blocks with ASD and adjusted the view with SHIFT+WASD, to give the player full keyboard control. Also, making the blocks transparent and giving a zoom option would have been helpful.
As it is, I was struggling to figure out how to rotate something this way or that way... And yet, the shapes were so small I wasn't even struggling a little! One last criticism is that I couldn't stand the fact that you can't make the blocks fall any faster! This made the gameplay extremely slow.
Other than that, great job! I love the 3D concept!