Is it any good? Hell if I know... but the price is right and I know a bunch of ppls who reckon it's good, so you know what to do...

https://store.steampowered.com/app/552500/Warhammer_Vermintide_2/

Pretty sure I've heard about this indie game a while back... 8 hrs left so gotta move quick.

https://store.steampowered.com/app/1127610/Iris_and_the_Giant/

... for a limited time only. It doesn't take long to play - I checked it out in less than 2 hours. Apparently this is the first of the 'walking simulator' genre, which is well named since that's basically all you do. It certainly looks nice, and there is a story of sorts although I have yet to decipher it so far.

Absolutely not recommended for Malus, this is quite 'arty'.

https://store.steampowered.com/app/520720/Dear_Esther_Landmark_Edition/

Syndicate Plus - presumably includes fixes so it works on modern OSs, apparently includes the American Revolt Expansion.
https://www.gog.com/game/syndicate

Syndicate Wars - hi tech from the 90s, swars introduces 360 degree panning to the isometric view... also, the origins of satellite rain.
https://www.gog.com/game/syndicate_wars

Ultima Underworld 1 & 2 - 3D dungeon crawler in the Ultima universe.
Trivia for game historians - made by the same studio that produced System Shock 2 a bit later.
https://www.gog.com/game/ultima_underworld_1_2

... on GOG until the 17th.

https://store.steampowered.com/app/46500/Syberia/
https://store.steampowered.com/app/46510/Syberia_II/