Apparently, I have an impersonator. His Steam profile: https://steamcommunity.com/id/lconan/

His Steamtrades profile: https://www.steamtrades.com/user/76561197962581702

Do not get fooled. I am level 80 with a 6 Years of Service featured badge.

Clearly, I'm moving up in the world

STEAM GIFTS
Alan Wake Collector's Edition
Castle of Illusion
Endless Space Collection
The Legend of Korra
Minion Masters
Monkey Island™ 2 Special Edition: LeChuck’s Revenge™
Risk of Rain
Why Am I Dead At Sea

STEAM KEYS AND/OR HUMBLE GIFT LINKS
1954 Alcatraz
200% Mixed Juice!
7 Wonders: Magical Mystery Tour
7 Wonders: Treasures of Seven
80 Days
Aarklash: Legacy
Air Conflicts Vietnam
Alan Wake Collector's Edition
Aliens vs Predator Classic 2000
Anna's Quest
Anomaly Defenders
Another World – 20th Anniversary Edition
Arkshot
Armello
Ashes of the Singularity: Escalation
Attractio
Back to the Future: The Game
Bardbarian
Ben the Exorcist
Between Me and The Night
Bibou
Bioshock Infinite - Season Pass
bit Dungeon II
Bit Trip 2
Blackguards 2
Black Mesa
Blades of Time Limited Edition
Bone - Episode 1 & Episode 2
Brigador: Up-Armored Edition
Broken Sword 2 - the Smoking Mirror: Remastered
Broken Sword 3 - the Sleeping Dragon
Broken Sword 5: The Serpent's Curse
Broken Sword: Director's Cut
Brutal Legend
Call of Cthulhu: Dark Corners of the Earth
Call of Juarez
Call of Juarez: Gunslinger
Calm Waters
Candle
Caravan
Chaos on Deponia
Civilization V - Gods and Kings
Cloud Knights
Cognition: An Erica Reed Thriller
Condemned: Criminal Origins
CONSORTIUM
Crysis 2 - Maximum Edition
Cubicle Quest
Cyberhunt
Danmaku Unlimited 2
Deadcore
Dead In Bermuda
Dead Rising 2: Off the Record
Dead Space
Deadly Premonition - Director's cut
Death by Game Show
Deponia: The Complete Journey
Dino Run DX + OST
Dirt Rally
DmC: Devil May Cry
Drakensang: Phileasson's Secret
Drod: Gunthro and the Epic Blunder
Dropsy
Dub Dash
Duke Nukem Forever
Dust: An Elysian Tail
Else Heart.Break()
Entangle
Epic Battle Fantasy 4
Etherlords I & II
Evoland 2
Face Noir
Farabel
Fist Slash: Of Ultimate Fury
Freedom Planet
FRONTIERS
Frozen Synapse
Frozen Synapse Prime
Game of Thrones: A Telltale Games Series
Gamma Bros 1.5
Gardens Inc. 2: The Road to Fame
Geneticognito
Glorkian Warrior The Trials Of Glork + OST
Glowfish
Gods Will Be Watching
Good Robot
Gothic Universe Edition
Governor of Poker 2
GRAV
Grave Danger
Hacknet
Hard Room
Hector: Badge of Carnage
Her Story
Hero of the Kingdom
Hero of the Kingdom II
Heroes of Annihilated Empires
History2048 - 3D puzzle number game
Holy Potatoes! A Weapon Shop?!
Homefront
Hot Plates
Human: Fall Flat
Hyper Light Drifter
Ice Lakes
Inquisitor Deluxe Edition
Insurgency
INTERFECTOREM
Into the Stars
I want to be human
Jurrasic Park: The Game
Kero Blaster
Killer is Dead - Nightmare Edition
Knee Deep
Kromaia
Lara Croft and the Guardian of Light
Last Horizon + OST
Legend of Dungeon
LEGO Star Wars: The Complete Saga
Lethal League
Lichdom: Battlemage
Lifeless Planet
Livelock
Lucas Arts Adventure Pack
Macbat 64
Magicka
Mainlining
Maize
Mars: Wars Logs
Memoria
Memento Mori
Metrico+
Mighty No. 9
Missing: An Interactive Thriller – Episode One
Monochroma
Munin
No Time To Explain Remastered
Octodad: Dadliest Catch
Oddworld Pack
One finger death punch
One Upon Light
Onikira: Demon Killer
Out There: Omega Edition
Pac-Man Museum - Ms. Pac-Man DLC
Pang Adventures
Pathologic Classic HD
Phantasmagoria 2: A Puzzle of Flesh
Pix the Cat
Pizza Connection
Pizza Connection 2
Plague Inc: Evolved
Planetary Annihilation
Poker Night 2
Poker Night at the Inventory
Police Quest Collection
PONCHO
Postal 2
Postal 2: Paradise Lost
Potatoman Seeks The Troof + OST
Pro Rugby Manager 2015
Project Druid - 2D Labyrinth Explorer-
Psychonauts
Puzzle Agent
Puzzle Agent 2
Quest for Infamy
Ratz Instagib
RefleX
Renowned Explorers: International Society
Resident Evil HD REMASTER
Resident Evil 0 HD REMASTER
Resident Evil 5
Resident Evil 6
Retro Game Crunch
Risen
Risen 2: Dark Waters Gold Edition
Road to Ballhalla
Robin Hood: The Legend of Sherwood
Robot Roller-Derby Disco Dodgeball
Rune Classic
Saints Row 2
Saints Row The Third
Saints Row the Third: the Full Packagae
Saints Row: Gat Out of Hell
Saints Row: Gat Out of Hell + Devil's Workshop Pack
Sam & Max: Devil’s Playhouse
Sam & Max: Season 1
Sam & Max: Season 2
Secret in Story
Security Hole
SEUM: Speedrunners from Hell
Shadowrun: Hong Kong - Extended Edition
Shadow Warrior Classic Redux
Shark Attack Deathmatch 2
Shiftlings
Shooting Stars
Sid Meier's Civilization III Complete
Sid Meier's Pirates
Silent Hill Homecoming
Simple Planes
Skullgirls
Skullgirls 2nd Encore Upgrade DLC
Slender: The Arrival
Snowball!
Soulless: Ray Of Hope
Space Quest Collection
Spec Ops: The Line
STANDBY
Steamworld Heist
STRIDER
Strong Bad’s Cool Game for Attractive People: Season 1
Stronghold Crusader 2
Stronghold Legends: Steam Edition
Super Meat Boy
Super Mega Baseball: Extra Innings
Super Rude Bear Resurrection
SUPERHOT
Supreme League of Patriots Season Pass
System Shock 2
System Shock Pack
Tadpole Treble
Tales from the Borderlands
Tales of Cosmos
Team Fortress Classic
Telltale Texas Hold'em
The Adventures of Fatman
The Baconing
The Challenge
The Chronicles of Narnia: Prince Caspian
The Dark Eye: Chains of Satinav
The Darkness II
The Deadly Tower of Monsters
The Final Station - The Only Traitor DLC
The First Templar - Steam Special Edition
The Flame in the Flood
The I of the Dragon
The Interactive Adventures of Dog Mendonça and Pizza Boy
The Last Remnant
The Last Time
The Nightmare Cooperative
The Silent Age
The Stanley Parable
The Walking Dead: 400 Days
The Walking Dead - Season 1
The Walking Dead - Season 2
The Walking Dead: Michonne
The Whispered World Special Edition
The Wolf Among Us
They Bleed Pixels
This is the Police
TIS-100
Tomb Raider I
Tomb Raider II
Tomb Raider III
Toybox Turbos
Umbrella Corps
Umbrella Corps Deluxe Edition Upgrade Pack
UnderRail
Unreal Deal Pack
Valhalla Hills
Valkyria Chronicles
Vampire: The Masquerade - Bloodlines
Victor Vran
Viscera Cleanup Detail - House of Horror
Viscera Cleanup Detail: Santa's Rampage
VoidExpanse
Volume
Warden: Melody of the Undergrowth
Warhammer 40,000: Regicide
Weird Worlds: Return to Infinite Space
Windward
Wings! Remastered Edition
World of One
World of Goo
Worms Clan Wars
Xotic Complete Pack
Yesterday
Zeno Clash
Ziggurat

Steam keys given away for free at some point that are actually worth a damn to me, at least
Agent Awesome
Alien Shooter 2: Reloaded!
Alter World
Bionic Dues
Blockstorm
Chimpact 1 - Chuck's Adventure
Crackhead
Defend Your Life
Deponia
East India Company Gold Edition
Endorlight
Energy Cycle
Freebie
Galactic Civilizations Ultimate Edition
Germ Wars
Gold Rush! Classic
Killing Floor
Knightshift
Lovely Planet
Lucius
Mind Spheres
Motor Racer 4
Nosferatu - The Wrath of Malachi
Numba Deluxe
Overlord
Pixel Puzzles UndeadZ
Pressure-R
Realms of the Haunting
Space Codex
Sparkle 2: Evo
Sparkle 3 Genesis
Syberia
Talisman
The Next Door
The Troma Project
Timore Inferno
Two Worlds - Game of the Year Edition
Weird Worlds: Return to Infinite Space
World War II Panzer Claws 1+2
Zombie Shooter 2

Steam keys given away for free at some point that most likely aren't worth a damn but that I'm listing here anyway
16bit Trader
Attrition Nuclear Domination
Chicken Shoot 2
Clickdraw Clicker 
DarkEnd
Devils Share
Earth 2150 - The Moon Project
Exowar
Flesh Eaters
Game Tycoon 1.5
Hacker Evolution Duality
Heli Heroes
Iesabel
Kabits
Midnight Carnival
Monsti
NeverEnd
Particula
Pirates of Black Cove
Showtime
Sleengster
Sleeping Valley
Solarix
Spheroid
The God's Chain
The Last Hope
The Safeguard Garrison
They Came From The Moon
Torch Cave
Torch Cave 2
Unforgiving Trials: The Darkest Crusade
Vitatio 2

Telltale keys
Poker Night at the inventory
Puzzle Agent
Puzzle Agent 2

Uplay keys
Assassin's Creed® Chronicles India
Assassin's Creed® Chronicles Russia
Heroes of Might & Magic III HD Edition (region locked to South America; also, it looks like a Steam key, so there's that)
Might & Magic Heroes VII Complete Edition (region locked to South America)
Prince of Persia: The Two Thrones (region locked to South America; it's possible that this one is global though)

Others
GameMaker Studio Pro - from the Humble GameMaker Bundle
Guardians of Ember + Wings In-Game Content Steam keys - from the Killer Bundle 9 (Bundle Stars)
LawBreakers Closed Beta + Rise Up Beta - from Alienware Arena
Revelation Online VIP Pack Key - from Alienware Arena