A fun, short, and well looking colourful game, and so far as I've seen, a pretty well done take on the theme.
A few points of critique. The middle/"real" screen is near to useless. I think I only used it for a short bit in the beginning, after that I stopped looking at it, which is a big shame as it ends up literally taking a third of the screen. Also I managed to defeat the shadow 3 times in unintended ways. Why unintended? Because I could see where you were supposed to kill it, and I decided to just cheese it. Maybe look into making sure that their environment is properly tested.