Really well done. I thought the difficulty scaling in particular was great.
One thing that stood out to me...there's a puzzle where the idea is figuring out that non-rotten carrots float. The puzzle starts with a rotten carrot in the water, so it can be assumed the player knows that behavior. As far as I remember, there was no puzzle that started with a non-rotten carrot on the water, so I'm guessing the idea is for the player to find this behavior themselves by just seeing what happens when a non-rotten carrot is thrown in water.... But I spent about 10-15 minutes just being confused since I assumed they would behave the same lol. That is a funny assumption to punish in puzzle and was a neat "eureka moment," but I'm a little torn. I maybe would've had a separate, previous instance where this floating behavior is shown, so at least some aspect of the puzzle is preserved, but it's not as potentially obtuse... But I guess it also kind of inherently makes sense in hindsight, like how logs float, but rotten logs sink... I can see both sides.
Anyway, enough rambling about one tiny thing. Very fun use of the theme as well across many aspects of the game, not just mechanics. Great sprite work; Tewi is a gremlin. I loved the two versions of the same theme while in and out of puzzles. The visuals and sound came together in this very pleasant, laid-back way. Stellar work.