It's not necessarily a #solarpunk game, but something for people who enjoyed #TerraNil :
I just learned there's a #Factorio mod which completely changes the game, making you terraform a lifeless planet into a fully-functioning biosphere!
https://mods.factorio.com/mod/nullius
Instead of polluting and fighting the local life forms, you're seeding life and creating new ecosystems to become self-sustainable.
With all the usual Factorio shenanigans.