Clever base mechanic! However, explaining it with shaders and vertex buffer could be confusing for people that don't know what these are. Even if I do know what these are, it was not so clear how did they affect my characters ability to move through the levels.
I played alone, so that might affect my opinion, but starting at level 1 each time I lost was very frustrating, I think levels could serve as checkpoints.
The minimalist graphics work very well in this game, but the ramps in level 2 were indistinguishable from walls sadly, and the height difference isn't really easy to perceive.
The music is catchy an fits well the graphics. I liked that it smoothly transition between levels.