This is legit so well designed!! At first I was like "Ok clever, but how do you develop this idea?" and then you did!
All the enemies and objects really work together to create some really interesting and exciting challenges/puzzles; having to put yourself in between enemies to keep them from shooting each other, having to dodge the "wrong" way to make sure the green turrets shoot you instead of an enemy, and chasing after the pink ones to keep them from causing chaos are all such wonderful ideas that all fit the theme perfectly.
My favorite moment was the introduction of the exploding orange boxes, because I was stuck for a minute until I thought "Wait, what were the rules again? Oh right, I've gotta take damage".
That, and the art is clean and the sound effects are suitably punchy. Very good game!