There are some things I don't quite understand.
Most of the puzzles I can just solve by dragging my slime across whatever terrain (except lava). Like, I don't need to push the blocks out of the way or anything, which I see is a mechanic, I can just drag the slime across. Is that intended behavior?
Other than that, the flowlab game plays music only some of the time. I also don't know if this is intended, but it was a bit distracting when it started playing only in one of the levels and then went quiet again.
Either way, I think the game has a very fun concept, and with some more polish and player onboarding, it could be a very good game.