As someone who doesn't normally play horror games by himself, this was a really fun time! Gameplay loop is fun and forces you to play by Cobb's rules once he gets going. I think what this game lacks is a real way to make Cobb as an enemy scary to the player. I'm sure others have brought it up, but he really only scares you as a way to lose your progress. I think a couple of special rules to make Cobb more terrifying to deal with could help the horror aspect a lot! Maybe something like Cobb can Cloak where he remains invisible around the map until he notices you, or You can Hallucinate where staying in the dark will cause fake Cobbs to appear around you to make keeping track of the real one more scary?
Just some ideas I came up with on the fly that could be tweaked by someone who knows balancing better than I do