I loved the concept, and the polish was top notch!
The gameplay was really fun when it involved figuring out how to arrange shadows. I liked including platforming as part of the gameplay, but the character control and camera movement made it difficult for me to position myself well to make the required jump.
The use of light and shadow works extremely well as aesthetic and mechanic, and I had a lot of fun with it. It did seem like the final (?) area with the orb had bugged shadows, though, because I died multiple times despite being rendered in shadow.
Really great job, overall! Had a blast.