It’s based around a city builder where you build a settlement from nothing until it is reasonably successful, takes an hour maybe, then your queen commands you to leave it to go settle another.

Each settlement has slightly different creatures populating it (humans, fairies, etc), different set of production buildings available, and different natural hazards and resources. So it is a scramble to set up production, roads and trade routes to fit the circumstances.

You also select difficulty modifier per settlement, which adds more mechanics and complexity as you feel like.

Between each settlement you upgrade your citadel, unlock new buildings and modifiers etc for your settlements.

There’s a lot more to it, but I hope that covers the important bits. :)