By no means did I purchase all bundles, and some games (I only saw two in the quick look I had) were duplicated, and the list does not guarantee that they are available on Steam, but the count I got was 141:
A Virus Named TOM, Misfits Attic; Amnesia: The Dark Descent, Frictional Games; And Yet It Moves, Broken Rules; Anodyne, Analgesic Productions L.L.C.; Anomaly Korea, 11 bit studios; Anomaly Warzone Earth, 11 bit studios; Aquaria, Bit Blot; Atom Zombie Smasher, Blendo Games; Autonomous Prototype, Double Fine Productions; Avadon: The Black Fortress, Spiderweb Software; Avadon: The Black Fortress, Spiderweb Software; Avernum: Escape from the Pit, Spiderweb Software; Avernum: The Great Trials Trilogy, Spiderweb Software; Awesomenauts, Ronimo Games; BIT.TRIP BEAT, Gaijin Games; BIT.TRIP RUNNER, Gaijin Games; Bastion, Supergiant Games; Bastion, Supergiant Games; Beat Hazard Ultra, Cold Beam Games Ltd; Black Lake Prototype, Double Fine Productions; Blades of Avernum, Spiderweb Software; Blocks That Matter, Swing Swing Submarine; Botanicula, Amanita Design; Braid, Number None; Brazen Prototype, Double Fine Productions; Broken Sword: Director's Cut, Revolution Software; Brütal Legend, Double Fine Productions; Canabalt, Semi Secret Software; Capsized, Alientrap Games; Cave Story+, Studio Pixel; Chocolate Castle, Lexaloffle Games; City Generator Tech Demo, Introversion Software; Closure, Eyebrow Interactive; Cogs, Lazy 8 Studios; Cortex Command, Data Realms; Costume Quest, Double Fine Productions; Costume Quest Prototype, Double Fine Productions; Crayon Physics Deluxe, Kloonigames; DEFCON, Introversion Software; Darwinia, Introversion Software; Dear Esther, thechineseroom; Dungeon Defenders + All DLC, Trendy Entertainment; Dungeons of Dredmor, Gaslamp Games; Dustforce, Hitbox Team; Dynamite Jack, Hassey Enterprises, Inc.; EDGE, Mobigame; Eets Munchies, Klei Entertainment; English Country Tune, Increpare Games; Eufloria HD, Omni Systems; FEZ, Polytron Corporation; FTL: Faster than Light, Subset Games; Fieldrunners, Subatomic Studios; Fractal, Cipher Prime Studios; Frozen Synapse, Mode 7 Games; Gish, Cryptic Sea; Gratuitous Space Battles, Positech Games; Greed Corp, Vanguard Games; Hack n' Slash Prototype, Double Fine Productions; Hammerfight, Kranx Productions; Happy Song Prototype, Double Fine Productions; Hotline Miami, Dennaton Games; Incredipede, Northway Games; Indie Game: The Movie, BlinkWorks; Jack Claw, Frozenbyte; Jamestown, Final Form Games; Jasper's Journeys, Lexaloffle Games; King's Bounty: Armored Princess, 1C Company; King's Bounty: Crossworlds, 1C Company; King's Bounty: The Legend, 1C Company; Kooky, Biograf; LIMBO, Playdead; Legend of Grimrock, Almost Human; Little Inferno, Tomorrow Corporation; Lone Survivor, Jasper Byrne; Lugaru HD, Wolfire Games; Machinarium, Amanita Design; Mark of the Ninja, Klei Entertainment; McPixel, Sos; Multiwinia, Introversion Software; Nethergate: Resurrection, Spiderweb Software; NightSky, Nicalis; Offspring Fling, KPULV; Oil Rush, Unigine Corp; Organ Trail: Director's Cut, The Men Who Wear Many Hats; Osada, Amanita Design; Osmos, Hemisphere Games; Penumbra Overture, Frictional Games; Prison Architect Preorder, Introversion Software; Proteus, Ed Key & David Kanaga; Psychonauts, Double Fine Productions; Revenge of the Titans, Puppy Games; Rochard, Recoil Games; Rocketbirds: Hardboiled Chicken, Ratloop Asia; Samorost 2, Amanita Design; Shadowgrounds, Frozenbyte; Shadowgrounds: Survivor, Frozenbyte; Shank, Klei Entertainment; Shank 2, Klei Entertainment; Shatter, Sidhe; Snapshot, Retro Affect; Snuggle Truck, Owlchemy Labs; Solar 2, Murudai; Space Pirates and Zombies, MinMax Games; SpaceChem, Zachtronics; Spacebase DF-9 Prototype, Double Fine Productions; Spirits, Spaces of Play; Splice, Cipher Prime Studios; Stacking, Double Fine Productions; Stealth Bastard Deluxe, Curve Studios; Steel Storm: Burning Retribution, Kot in Action Creative Artel; Super Hexagon, Terry Cavanagh; Super Meat Boy, Team Meat; Superbrothers: Sword & Sworcery EP, Superbrothers + CAPY + Jim Guthrie; Swords & Soldiers HD, Ronimo Games; TRAUMA, Krystian Majewski; The Bard's Tale, inXile entertainment; The Basement Collection, Edmund McMillen and Tyler Glaiel; The Binding Of Isaac, Edmund McMillen and Florian Himsl; The Binding of Isaac + Wrath of the Lamb DLC, Edmund McMillen and Florian Himsl; The First Avernum Trilogy, Spiderweb Software; The Geneforge Saga, Spiderweb Software; The White Birch Prototype, Double Fine Productions; Thomas Was Alone, Mike Bithell; Ticket to Ride, Days of Wonder; Tiny & Big in Grandpa's Leftovers, Black Pants Game Studio; Toki Tori, Two Tribes; Torchlight, Runic Games; Trine, Frozenbyte; Trine 2: Complete Story, Frozenbyte; Uplink, Introversion Software; VVVVVV, Terry Cavanagh; Vessel, Strange Loop Games; Voxatron, Lexaloffle Games; Voxel Tech Demo, Introversion Software; Waking Mars, Tiger Style; Windosill, Vector Park; Wizorb, Tribute Games; World Of Goo, 2D Boy; Worms Reloaded, Team 17; Zen Bound 2, Secret Exit Ltd.; Zen Puzzle Garden, Lexaloffle Games