Backrooms liminal spaces

(So far, only levels 0, 1, 2, 3, "!", 37 and 94 are ready. Of the entities, only Bacteria, Skin Stealer, and Hound are ready. You can write in the comments to the bot what else you would like to add.)
When you were at home, you decided to get up from the couch. You went to the kitchen, and suddenly the floor beneath your feet seemed to lose its hitbox, and you fell. You fell, but not in your house, but in the backroom, or more precisely, not in its level 0.