You should make the lights flicker a bit more when the entity approaches (atleast for earlier stages), I would also add shadows to the entity light so it casts cool patterns through the locker slats, other than that Its looking really good especially in the sfx department (though I do agree the rain sfx are a little loud)
edit :
Actually a small detail idea, you can tweak the FOV based on if the player is in a locker or near an entity, so while your in the locker the lighting effects are easier to see