Love the ambiance that's created and the small beginning cut-scene really helps with that.
Short light range works well too for this.
I think the player could be a bit faster, or the map smaller, but it felt very slow and eventually tedious.
I was sometimes a bit confused as to what was a wall and where I could walk, so maybe you could have considered making walls darker to sell the illusion?
Didn't really stick around too long sadly, but noticed the voice acting, top notch !