Jumped into this for a few minutes because the idea piqued my curiosity... and half an hour later I'm still going. I'll hopefully jump back into this again soon - I really love it.
Only recommendations I could make it finding a way to make the enemies "pop" more in certain areas as they seemed to blend in to the rooms a little bit. There are also a few issues with keyboard controls in the pause menu where it's not obvious to press the right key to move over, but that's something minor.
Oh! Also the save system doesn't seem to work? I tried to continue and it put me in some room I hadn't seen before and I think the character spawned in a wall :)
Keep it up, can't wait to play more of this!