I really like the post processing effect you used on the camera! it gave everything a very atmospheric and mysterious look! I do have some little things that could be added in the future (or in a different game) that could improve it, like a healthbar, pause menu a basic in-game tutorial, and a camera that extends a bit more forward (especially during the jumping parts) are all relatively easy things to implement that could improve the quality of the final game a lot!
But overall a very cool little game, with some nice responsive controls and some REALLY nice looking sprites!! great job!