Before looking over my review, the crucial information about me is that I have strong prejudice against games based on the popularized idea and concepts, such as the new "meta" Backrooms. Previously, it was P.T. and FNAF and Slender Man, but now it's this. Yet, beyond all my concern for the developers being confronted with that issue, I do love this game and the execution is neat.
The concept of Backrooms and Slender combined actually makes more sense, as I have not see or played such before, now when I think of it, the idea of the game seems decent. As long as you, as the developer can go on and add more uniqueness to it the game would work.
Good luck with this one dev. I do wish to see the continuation and please, make it count and keep on going. Well-done.