Really liked this one, it fits the theme nicely and the tension works well. The light mechanic especially adds to the atmosphere, though it can make things pretty tough when he finds you so quickly. I saw the note about holding E/LMB to open doors and containers silently...that definitely clears things up, since without it he was on me every time.
I think what’s here is already fun, but you could take it even further with clearer stealth cues (like subtle sound/visual hints showing how much noise you’re making), or maybe a way to briefly counteract when the lights go out so the player has a fighting chance. Overall though, really cool concept and definitely worth replaying!