Although it's not exactly the Backrooms concept, it shares the liminality of it. It is called Superliminal, currently available in the Xbox Game Pass, Steam and other services.
"You go to sleep watching TV at 3 am, and you remember of an experimental therapy program." Everything works through perception and optical illusions and always thinking of a new solution to escape this absolute madness of a dream.
Here: https://store.steampowered.com/app/1049410/Superliminal/
If you have motion sickess or labyrinthitis, it is recommended not to play.