At its simplest level, Journey is a game about walking. You start in a desert, controlling a character without a name or a backstory or even knowing if you’re human. Your only objective comes from the camera angle pointing towards a mountain in the distance.
So you walk up a small hill and start to learn this is how it’s going to work. The game isn’t going to tell you anything. It’s going to give you a vague sense of direction and let you go there when you’re ready. There’s no challenge. You move slowly. And your only abilities are to jump and shout, or whatever you call it when your character emits a sonar bubble to interact with the world.