Oh wow, that really took the concept and ran with it. I enjoyed walking around dark enviroments throwing about the light orbs and finding the crystals.
Though, I think the light orbs themselves lacked utility. I feel maybe an enemy stun on hit would of been nice? I noticed they bugged out alot and exploded on wall hit. But the light ray itself was a great tool, since I felt like I was really vanquishing a shadow of the night. What I would of changed is maybe making enemies more aggressive, and so that the light ray would stop them in their tracks and melt them fast. Or cause them to run away with the damage they recieved.
But overall, a nice idea if you flesh it out more in future.