From the itch.io page:
In Apotheosis, 2-5 players will explore the relationship between a culture’s history and their dominant cultural story as they create and change a legend over the course of generations.
Your goal as players is to tell an interesting story about the culture you’ll develop, and to tell their dominant story in turn. You’ll be telling this story collaboratively: each player will be roleplaying as an abstraction of the culture, not as specific characters.
You’ll create and develop the basics of the culture together, seed their original dominant legend, and then watch that legend change as major historical events occur. This is a game about the relationship between what a culture experiences, and how they represent that in the stories they tell each other.