Styx: Master of Shadows: About a goblin assassin, focused A LOT around being sneaky, bad combat mechanics but again its all about stealth kills.
Stardew Valley: You are a farmer, take care of your farm, earn money, can even romance some of the villagers and have kids.
Don't Starve: Open world survival, turn off the wolves, you dont want to deal with the wolves i promise.
Metro 2033: Dystopian future where you play as a man stuck under ground with other people having to survive, you have to go above ground to destroy a grove where the monsters nest lays.
Skyrim: This one is self explanitory sense just about EVERYONE knows this game.
Dragon Age: Inquisition: Now im not sure if this one is on steam or not, I personally have it on Origin because of the pack. But it is a GREAT game, free world, dragons to fight, millions of quests to do, romanceable characters, I love this game.
Borderlands & Borderlands 2: Both are great games, another dystopian future setting with bandits, psychos, and other things, another open world questing sort of deal with a primary plot.
Life is Strange & The Wolf Amoung Us: Both are pick your own story and it shapes the plot line sort of deal, LIS will really pull at your heart strings, and TWAU is a very hard case in plot and has you make a lot of hard decisions