Gimme gimme a balanced couple in a survival game. I love the complex ones even if I have to reread. BUT I prefer supernatural circumstance instead of apocalypse. they don't have to be together every chapter. All romance is OK. systems are ok. (BONUS: it's sub-romance, if the protagonist is non-human or eccentric)
High Energy QR Code! The game worlds are really good, it's more plot > romance but the main couple are adorbs. Great world-building and characterization.