Thanks for playing and thanks for the feedback!
My intention was that each creature would be puzzle by themselves, so the player needs to carefully observe them and think about how to counter them, so maybe I need to make this clearer with the level design itself.
I do agree that sleepy ( the square one ) is a bit too strong currently, but I really like how his mechanic makes the split his attention between his own position and sleepy's position and forces the player to use all of his tools (slow moving and queue shifting) to properly counter it.