Rimworld is number 1, hands down. I guess this is my answer, but I’m going to include more games

• Factorio - enough said
• Minecraft/7 Days to Die/Valheim - I can create my own world and story
• OpenTTD - so much rail transport
• Civ4 - so many mods (Fall From Heaven makes it a great fantasy game)
• X-COM 2 - difficult tactical decisions