there are ways to leave, but all of them result in you getting an ending shortly after (most notably, kumalala chasing you out of the backrooms) = you cant access other content after you enter the backrooms
Do you think it would be cool if there was ONE way to leave the backrooms that Doesn't give you an ending and that gets you a special item like powerful weapon armor or something that would be cool
no way to escape the inverted world, no. closest thing to escaping is entering the backrooms' poolrooms route from there, but that locks you in the backrooms