Gravity Bone
Thirty Flights of Loving
Quadrilateral Cowboy

Dwarf Fortress
Brogue
Rift Wizard

GUN GODZ

Lyle in Cube Sector
Infinifactory
Infiniminer
The Kingdom of Loathing
The Gostak
Chango
Vertex Dispenser
Sing a Song for Freddy
wow why can't i find this indie game? it's like a spaceship deckbuilder game? and it's cute? Cobalt Core
Cortex Command
N
Liero
Little Fighter
Ace of Spades (not the one currently on Steam, the other free original one)

Gish

Execution (2008)
Inside a Star-Filled Sky
Megane
Corrypt
Psychonauts (does Psychonauts count?)

Spelunky
White Butterfly
Counterclockwise
Minecraft
Manifold Garden
Moirai
Uurnog Uurnlimited

Haven & Hearth
the cyberpunkish game that's a first person dungeon crawler that i didn't finish that A recommended what was it called
Diaries of a Spaceport Janitor
Fit for a King Fit For A King

cute jump (sylvie)
There's a Beautiful Star (HaoLiao)
fast car (moochi)
ap  drive (Andy Sum)
And Other Stories
Slay the Princess
UNDERTALE
Nidhogg
that really insane text adventure puzzle game with the magic spellcasting that's free on Steam but you can buy a certificate o "not cheating" . . . i'll find it Hadean Lands
Suveh Nux
Elona

Myre (card game by Zach Gage) (i'm going to have to go back and add sources for all these won't i)
actually now that i think about it i should probably limit it to 1 per developer