New game mode "You and Me".
In this game mode no chargers instead you get a friend, like the BoI games, you start with Isaacs, he has his health that show next yhe heart counter, you can move him like the minecart, also shots when a enemy on the same line, it a enemi reach him he taking damage slowly and its health is reach zero you lose, few upgrades effect both him and the babies few may mske him stronger, each round end have a chance to shows a friend update.