Empty World is a game in an empty world. You'll have nothing to do and nothing to interact with. You'll feel the stressless situation of having no input. Empty World is about escaping reality, escaping input and deadlines. It is about doing nothing at a slow pace. Once you've become bored with doing nothing, it is about doing one thing at a time.
You can sit around in silence for as long as you want to, and when you're done doing nothing, you can choose to have something happen. Then, every day, a new thing spawns. However, Empty World is a minimal game, offering only one simple enemy and one simple boss as a challenge as you try to see how many days you can survive.