Suggest me a game.

Alan Wake

Too the Moon

Dungeons of Dredmor!

Bad Rats. :3

Fortix 1 and 2 !!!! Old mechanics, new addictive style. it's only $ 1 and $2 on steam resepectively. I got it as a bonus on the groupees bundle and been playing it a lot. it's fun.

Shining Force series

Star Wars: Master Bayts

arma3

If you liked OMD, play OMD2coop.
Maybe L4D2?

Super Hexagon. Buy the two-pack, give the extra copy to a friend, and settle all of your arguments by your relative positions on the leaderboards.

Also, I recommend that you finish Bastion. It starts slow, but it gets much better and the ending is beautiful.

no

Shank

Seriously command air naval operations is just awesome

Rapelay

Dungeons of Dredmor
Dawn of War, Men of War, Company of Heroes (if you like rts that is)
Terraria
Super Meat Boy
Red Faction Guerilla (if you have never played this, PLAY IT! it is awesome :D ) also, don't play Red Faction Armageddon, it isn't that good
Leviathan

Dark souls
Hitman Absolution
Arma II CC for DayZ
APB Reloaded
Skyrim for the mods if you havent already
State of Decay
Mount and Blade: Warband
Just some of the games I like

FTL , it has a deep soundtrack too

low price, lots of hours of frustration yet addicting gameplay with high replayability: "The Binding of Isaac"
free, scary and with a tension building, immersion and deep atmosphere i've yet only seen in "Amnesia - TDD": "Cry of Fear"
if you want to spend a bit more to let you immerse during the cold days: "The Elder Scrolls V - Skyrim" (or "Far Cry 3", if it's too cold and you want some comfortable warmth by killing bloodthirsty pirates at a paradise island)

Vessel, FEZ, Braid or Limbo.

Have a nice day :)

Have you tried tiddlywinks?

Fallout and Fallout 2 - two best PC games ever created in my opinion :-) There is a fresh new Restoration Project by Killap for Fallout 2 which makes it a good choice to play again even for those who completed it several times!