Fun and challenging game, the animations of the slime are adorable. I like the attention to detail that carrying a coil reduces the jump height, and you also incorporated it into the puzzles. I finished all of them, but some were quite hard, or had to be repeated a couple times. I could already foresee the twist at the end, but it was still funny.
The mechanic and puzzles are well thought out, and some people already gave you notes for improvement. Only thing I would add is that at first I didn't realize that when I wanted to attach rope to another object that the slime counts as an obstacle as well.
Good job, guys.