I'm trying to come up with game concepts that people would be interested in, this is the first one I've thought up

It's called: "Your Best Friend Lives in the Backrooms."

You find an entrance into the Backrooms. While exploring it, you came across a girl unlike any other you've ever met — and become fast friends. Before long, you both start spending most of your free time together.

But one day, something changes. And now, she doesn't want you to leave.

Thoughts on the idea?