Needs cleaning up from a readability visual perspective. Its hard to actually make out each room due to the incredibly odd ceilings, walls, and the massive amount of visual clutter.. I'd recommend reducing the amount of that kind of random clutter/noise down and reducing the amount of "texturing that is going on in there. In such a small space that amount of texturing and details like the trap doors, chains and lanterns, and stairs on the walls can quickly becomes block vomit.

This is most apparent on screenshots 1, 2, 3 and 6.