A very interesting concept and the visuals to back it up (other than the environment). Though a bit of the game does feel quite punishing. Especially if you don't make it to the first checkpoint. The shooting also felt very awkward and imprecise which wasn't too helpful. Though as a side note I did have a bit of fun with the few enemies I fought just slamming into them like a roomba. Which is, kinda what the player looks like. It has some interesting puzzle potential, though a few things are left unexplained. Like the lower jump height without all 4 "tanks" for one. Which led to a lot of frustration in the first area (mostly after dying with one and the red one being locked)
Overall though, interesting controls, cool mechanics and a nice setup. Also 3D :)