Cool concept, nice atmosphere. Tho corridors can be a bit frustrating as there are a lot of invisible walls.
SPOILERS
Liked the way monster showed up, the shadow actually scared me :D
Yeah one of the few downsides to using prefabs and 1 bit pixel art is that some of the corridors can be a bit samey if you don't add enough variation. At any rate, I'm glad you enjoyed the encounter at the end!