Pulled from my Top Playtime on Steam (so you know you’ll get your money’s worth if you like them!)
Factorio (Even though the DLC is pricey, it at least doubles the playtime. Though, like RW below, it takes a lot of content/concepts from fan-made mods.)
RimWorld (Though I dislike how many DLCs they’re pumping out and how much is basically taken from mods.)
Terraria
Mount & Blade (Warband 1 & 2 are prime)
Kerbal Space Program (NOT the sequel)
TerraTech (The original is a better experience)
Both the Pathfinder games
Grim Dawn
The Riftbreaker
UnderRail
Mindustry (Open source/free, but deserves the support from buying it on Steam.)
No Man’s Sky (They’ve gone above and beyond in shaping up since the clusterf release.)
The Long Dark
Rise to Ruins
Space Pirates and Zombies (1 and 2 are both great, in their own ways.)
Caves of Qud
Tales of Maj’Eyal
STALKER (I’ve heard bad things about #2, but the rest are great, high replayability with Anomaly.)
Pulled from my Top Playtime on Steam (so you know you’ll get your money’s worth if you like them!)
I’d like to add Satisfactory to this list.
The Riftbreaker is fun and graphcally nice to look at. For city builders, I’d also like to suggest:
Lets be real here… Factorio probably has more time played than all the others combined right? lol
All combined? No. Top in playtime by a very large margin over #2? You betcha! 😁
Amazing. Thank you!