Fun concept and honestly an really good level design, made me feel smart in some levels once you get it. Also the movement is tweaked nicely, which is a problem often encountered in jam platformers, good job on that !
The ambiance is pretty relaxing and sweet, love the little speech bubbles you added for the duck :) Only feedback I have is that the sfx are a bit too loud compared to the music imo but it's a nitpick.
Seems like it only needs time for some polish, but it's normal in a game jam and the art direction you went for is a good idea, you made good choices ! Game has it's charm already
Good job :)