Very fun game, love the music and animations.
I really like how you can see the three colors behind the enemies to quickly figure out the formation needed.
It plays like a rythm-game so it would be nice if the enemies came in formation depending on the music (so the sound when they reach you happens on beat)
I would always first match the head with the enemy as it was the easiest to notice but then if I needed to swap the top and bottom guys it required 3 button presses which made it quite slow. I'd like to have a button for swapping the top and bottom positions.