Satellite Reign
Tormentum - Dark Sorrow
Darkest Dungeon
Prospekt
Chaos Reborn
Ori and the Blind Forest
TechnoBabylon
SuperHot
Firewatch
Keep Talking and nobody explodes
If you want to go cheaper and add a key - I can consider these
The vanishing of Ethan Carter
Mount & Blade: Warband
Styx: Master of Shadows
Agarest Generations of war
Desktop Dungeons
Rocket League - ROW HB link
Satellite Reign
Tormentum - Dark Sorrow
Darkest Dungeon
Prospekt
Chaos Reborn
Ori and the Blind Forest
TechnoBabylon
SuperHot
Firewatch
Keep Talking and nobody explodes
If you want to go cheaper and add a key - I can consider these
The vanishing of Ethan Carter
Mount & Blade: Warband
Styx: Master of Shadows
Agarest Generations of war
Desktop Dungeons
You can also look here http://store.steampowered.com/app/226620 but I won't go for the low-level stuff.