https://store.steampowered.com/app/4...urviving_Mars/
Fun colony simulator from Paradox Games, who I have become a fan of.
Lots of replay value as you try out different strategies and you can ratchet the difficulty up to some insane levels.
They also offer a lot of storylines that make for more replay, such as "what if there is a huge war on earth" or something similar.
Solid 8 for simulators.