Evolve

An incremental game that starts you as primordial slime and runs all the way to interstellar civilisation. You begin by clicking to gather a single resource, and within an hour you are balancing population, research, trade and power across a planet you are steadily terraforming. It is enormous — genuinely hundreds of hours of content, with multiple evolutionary paths and a reset mechanic that unlocks new species. Far and away the deepest game in this catalogue.