Very good art, and a fairly neat concept. I feel like the game is a little too unforgiving, though. The idea that they can't collide with each other feels like a step too far to me. Also, maybe instead of all walls meaning death, maybe you could place hazards to avoid (spikes, lava strips, whatever suits your fancy). I also encountered a bug where B.O.T. would just rocket off for no reason and die without me having touched anything.