Overall this game was super fun! I love how you really make use of the core mechanic in later levels and teach the player through gameplay without any wordy tutorial or anything, like a good platformer.
I ran into a small bug, where the volume when changed from the main menu reset when you start the game, but I think that was the only bug I ran into.
If I had any critique it would be to add more coyote time, and maybe a sound effect when the shadows die.
Overall a really fun idea, really intuitive for the player, and lots of fun mechanics! For a game made in such a short time I think it was awesome!