• Oxygen not Included

• Caves of Qud

Not run through Steam, so no Steam stats (though available on Steam) but I’m sure that they’re way up there:

• Cataclysm: Dark Days Ahead

• Dwarf Fortress

• Dungeon Crawl: Stone Soup, though that’s going back a few years.

Some others with a fair bit of playtime:

• Steel Division II (really primarily a multiplayer game, but I only play single-player)

• Elite: Dangerous. Though I don’t remember how I accumulated that many hours. Wasn’t super-impressed with the game, and would have sworn that I’d have more time in X3 (though maybe that gets split across the DLC or something).

• Stellaris

• Noita

• Nova Drift

• Starfield

• Rule the Waves 3

• Carrier Command 2 (Primarily intended to be played multiplayer, but I play single-player)

• Kerbal Space Program