Well this is interesting! A two-dimensional backrooms game might actually be better than all the three-dimensional ones already out there. I'm serious, because I think all the existing games have an unhealthy fixation on monsters. This game might be able to balance its monsters!
I would suggest instead of stopping the tilemap at the edge of the maze, maybe you could make it loop around and show the tiles at the other side? IDK how easy or hard that would be, but it would be interesting and infinite.