I really enjoyed this game! The gameplay was clever and had very nice puzzles. On level 4 the robot would be under a tile for some reason. Other then that I didn't encounter any bugs. If you wanted to improve, I suggest making the 'r' to restart even faster. I also recommend having symbols on the tiles rather then color, it was hard to tell at a glance what color did what. Overall fun game!
Check out mine if you get a chance!