https://github.com/Revolutionary-Games/Thrive
This entertaining game aims to be a scientifically accurate evolution game, starting off as a single-celled organism and growing into more complex organelles, competing against other organisms in the environment.
https://store.steampowered.com/app/1779200/Thrive/
It is still in active development and later stages aren’t fully fleshed out yet but the early stages can still provide a few hours of fun.
There’s still a lot of people who simply yearn for a more complex spore type game. Spore’s first evolution stage was supposed to be quite a bit more complex to what it ended up being too. You can still find some old presentation video of it around on YT but the quality suffered as one of the older YT videos and only has the low res one on offer.
