Great idea and especially good considering it's a game jam game. The graphics are nice and the core mechanic is interesting.
On the downside the controls don't suit this kind of game. The lack of precision of the controls combined with a lot of punishing insta-death spikes and toxic goo make it difficult to play. It's frustrating when you know how to solve the puzzle but you're stuck because it's tricky to jump and land where you want without dying.
The puzzle mechanics are interesting enough to not need the extra complication of precise platforming and lots of hazards.
With some polish (mainly tighter controls and less punishing level design) this could be a really solid game.