I found a bug: in the second level my green boy died on spikes, so to restart i threw the yellow and the blue in a hole, but then every time I start the game I instantly get a game over.
Not penalizing you for this, just to let you know.
By the way, The idea is really cool and interesting, and the game is overall fun to play. I didn't like the enemies very much, because they move fast and it's not clear when they'll change direction.
Good job anyway