Really cool concept. I love the mechanics of being followed like moths. I feel though it would a little fair for the player to be able to catch some lights that the enemies can't catch. Or maybe I am getting this all wrong;
I really love the concept and the simplistic art style. I can see a very simple music like GRIS going along with that game. And a small story of the wizard just trying to save a light that has some kind of emotional value for him. maybe light of a forest, like in Ori and the blind forest or something like that.
Great job !