Nice concept and shadow mechanic is a good thought one. I also appreciated that you don't die immediately in light. Story is a good addition too.
One feedback i can give is i think jumping feels a little too floaty for a platformer that set in rather small levels. I think shorter jumps and maybe shadowy particles coming up when you land could improve the game's feel a lot. As others said sprites jitter when the camera moves but i'm sure you'll fix that.
Game's length was good for a jam and it left me wanting more, great work!
Viewing post in Cure the Shadow jam comments
Thanks for playing! I agree that the jumping may be too floaty, especially because of the small levels! In my next games, I will probably take into account how big/small my levels are and adjust those values accordingly.
Additionally, I think shadowy particles would indeed be a great way to polish up the game more!