story
I agree that Mini Metro is the one of the listed games that I would be least certain about. I think however it is very polished (more than other "puzzle" games) and it strikes a nerve because the design is very familiar to people using metros or buses.
Papers Please is a very special case. It has a very unique idea and that's what makes it stand out. You are right that you need to play it. However if someone played it he will most certainly recommend it and that's the strength of this game.. the implicit "marketing" it conveys.
You obviously always need some marketing be it a only dev log or whatever to at least get the core group interested. For a game like PP that really should suffice to get the ball rolling.