Congratulations! Fantastic take on the theme with the shadow mechanic - I loved the use with the different puzzles (the fireflies part was super nice). I really liked the sense of urgency at the end.
My only constructive take would be to try and change the camera on the shadow form to take the character more on the center of the screen, for example on the fireflies part it would've made it a bit more approachable given that you would be able to see where the ending ledge is.
Other than that, I loved it and wanted to play more. Keep it up!
And again, congrats on the submission!