Atomic Heart is a first-person, action-RPG set in a world of killer robots. The game isn’t the best at explaining some of its mechanics, so I’ve put together a list of tips that I would’ve loved to have early on. Here are 9 things I wish I knew when I started playing Atomic Heart. Atomic Heart is a first-person, action-RPG set in a world of killer robots. The game isn’t the best at explaining some of its mechanics, so I’ve put together a list of tips that I would’ve loved to have early on. Here are 9 things I wish I knew when I started playing Atomic Heart.