Really well put together game! :) Great art. The music is makes it super chill, and except for those freaky monsters the rest of the game is the same.
I had a little trouble with the jumping, I thought I had landed and want to jump again but it didn't register? Pretty minor really. Other than that I think there were a couple of unnecessarily difficult timing/jumping pieces (particularly that bit where you change screens and you might not know where the monster is positioned) in my opinion, since it seems you were going for the relaxed vibe and that was unnecessary stress. :)
Overall really solid submission, I'm impressed, well done!