The game is easy to understand and play, I like the art and the music. I appreciate that you added in small details (for e.g. the smooth camera transition through the levels). I really like the Background UI, it just looks so mesmerizing. The tutorial was easy to follow.
I guess my only problems with the game is the sudden, difficulty spike on the second level after the quick tutorial. I wish that the robot would appear more, because it would fit more with the theme.
Other then that, great game!