Oooh, I love a good puzzle game, and this one definitely is! Level 14 and 15 have bested me so far and I gotta play some other games, too, but maybe I'll come back to them later. Only major gripe I have is that I really really want an undo button, and a small nitpick is that it would be nice if it was more visible how things were attached to each other. Apart from that, great job!
(Also, this sort of reminds me of a game I played as a child where you also played as a snake and if you ate a poison apple you could shed your skin, but I just cannot find it anymore :/)