Wow this is actually really good!
It's very polished, especially the shaders make the game look very elevated. The concept is nice, although I've seen similar games under other themes before (I think Death isn't the end, or something like that) but it fits this theme, and that's the important bit. I would add an option to disable the wobbly shader as it made me a bit dizzy after a bit. Also, your game could really profit by having coyote time as further polish. I've attached an example, where I technically solved the puzzle, but had to restart because my jump was just short. Coyote time could've really helped me out there. But time's short of course :)