You created a very atmospheric game there - I like the vibe and I love the font! As others mentioned I strongly suggest you to use coyote jump for the next platformer - I also learned this during a Jam and it really improved the game.
I like that you implemented a story! Music is fitting and okay, art assets are well chosen, but I would suggest keeping the style cohesive (with or without outlines).
Gratz on your very nice submission! :D