Bastion

BIT. TRIP RUNNER

The Binding of Isaac.

• Eador

Eador Steam Page

The Walking Dead

FEZ

Honorable mentions I can think of:
Journey, Waking Mars, Antichamber, Terraria, Limbo, Cave Story, Super Meat Boy, Spelunky, Jamestown, Legend of Dungeon, Hotline Miami, Don't Starve, Nimbus, Kentucky Route Zero, NightSky, Deadlight, Legend of Grimrock, Anodyne, Bastion, Hammerwatch, Rogue Legacy, Stealth Bastard Deluxe, Superbrothers: Sword & Sworcery EP, Surgeon Simulator 2013

Braid

Frozen Synapse

Bunny Must Die! Great metroidvania but sadly it has been stuck on Greenlight for a long while :/

Iji.

Beat hazard! :D

Absolutely "TO THE MOON".

Red Orchestra 1/2, Bastion, Hotline Miami, FTL. Can't pick best :D

does anybody actually play this kind of games? pffshshsffshff....

Bastion
Thomas Was Alone
Terraria
Tiny and Big
Braid
Magicka (many bugs, but a lot of fun!)
Strike Suit Infinity (reminds me Rogue Leader for GameCube...)
Hotline Miami
Cave Story
Superbrothers: Sword & Sworcery EP
Stealth Bastard Deluxe

swarm Arena on stream, because you can Play it with 2 Players on one pc :)

Hard Reset

The Binding Of Isaac, Hotline Miami, Game Dev Tycoon and Primordia.

Minecraft, the Touhou series.

Rogue Legacy, Constant C and Amnesia

Defense Grid.

Terraria

Minecraft, To the Moon, Bastion, Dear Esther, Thomas was alone, Botanicula, Limbo, Antichamber, Kentucky Route Zero

Trine and Hotline Miami.