I found the exit door and beat the game! I like backrooms as a setting in general.
You have a nice framework to build off of if you add to it.
Feedback:
There wasn't much to do other then run around and randomly find the exit. Some more gameplay mechanics would make the game a lot more engaging. I didn't find much use in the hideaway closet.
It would be cool if you utilized the companion theme, backrooms with a companion could be really interesting.