Over the last few weeks I've been playing Microtopia which is a game about ants that are microprocessors/mechanical. It is a factory simulator, but the base components are the ants and production buildings.
The ants have a lifespan, so you are managing them as a resources that is also required to make more of themselves. And there are not any belts or inserters as in most games, but instead the ants act as the logistics system, the resource gathering system, and the productive system.
It's a slightly fresh take on the genre, and it was fun to learn the novel systems. However, it really could use some QOL and some options for lower graphics settings.
These sorts of games are fun for me because they allow me to solve small problems that slowly lead to complex systems. I really enjoy the feeling of accomplishment from building something complex like this.