It was a fun game! Quite an unexpected setting for a Halloween jam, but it gave me a really nice nostalgic feel and reminded me of some old-school platformers. Nice work!
Ideas for improvement: play a bit with layers, constrasts and depth. It was not always clear enough what is game layer, what is back, what is front, etc. E.g. currently it make me feel as the water is just a paper and the animal is paper behind it, and the animal inside the water. While tree sharpness is not matching the player sharpness - so it feels as trees are just a part of background and not the part of interactable layer where you can jump.