I've tested all the Humble Mobile Bundle games I own with the controller and mapping software on my GPD-XD. There might be some games missing because I haven't bought every bundle, and didn't pay enough to unlock all of the games on some of the bundles I did buy.
- Anomaly 2
- Another World
- Aquaria
- Badland
- Bardbarian
- Canabalt
- Don't Move
- Double Dragon Trilogy
- Frozen Synapse Prime
- Galaga (portrait mode only)
- Leo's Fortune
- Lost Echo
- Metal Slug 3 (use R3 to select menu options)
- Mikey Boots
- Oddworld Stranger's Wrath
- Pacman CE DX
- Pacman Championship Edition
- Puddle+ (change control scheme to gamepad in options)
- Raiden Legacy (portrait only)
- Riptide GP2
- Space Marshals
- Super Hexagon
- The Bard's Tale
- Time Surfer
- Trouserheart
- Unmechanical (not optimized, no indicator to show what menu item is selected)
- Wayward Souls
- Ys Chronichles 1
- Zombie Gunship
- Anodyne (movement works, but nothing else)
- Bean's Quest
- Costume Quest (movement only, can't interact with stuff)
- Dynamite Jack (for movement only, can't use items)
- Glork
- Gunslugs
- Incredipede
- Neon Shadow (mappings are not ideal and non-configurable, can't select menu items in PS3 mode)
- One More Line (portrait only, but playable in landscape)
- Rocket ROBO (accelerometer used to steer)
- Solar 2
- The Deer God (mapping is screwy, couldn't jump, unplayable)
- VVVVVV
No native gamepad support, but can be played with a 3rd party mapper to translate buttons into taps or swipes (touch still required for menus, etc.):
- ALONE
- Amelia
- Aralon
- Beat Hazard (difficult to play with mapper)
- Bladeslinger
- Blocky Roads
- Box Cat
- Carmageddon
- Clash of Puppets
- Crush the Castle
- Devious Dungeon
- Dungeon Defenders
- Flappy Golf
- God of Blades
- Gravity Duck
- Jones on Fire
- Karateka
- Lara Croft GO (kind of works to move Laura, touch still needed to interact with objects)
- Mage Gauntlet
- Mines of Mars
- Night Sky
- Paper Monsters
- Pocket RPG
- Pumped BMX 2 (also uses accelerometor)
- Punch Quest
- QWOP
- Quest of Dungeons (difficult to play with mapper)
- Real Boxing
- Relic Rush (portrait only)
- Ridge Racer Slipstream
- Shadow Blade
- Slingshot Racing
- So Long, Oregon
- Space Chicks
- Super Stickman Golf 2
- Swordigo
- The Nightmare Cooperative
- The Spookening
- Titan Attacks! (doesn't work very well)
- Vector
- Wave Wave
- Wave Wave 2
- The Blocks Cometh (fakes landscape mode so mapping buttons can be tricky)
- AaaaAaaa
- Anomaly Defenders
- Anomaly Korea
- Autumn Dynasty
- Avadon
- Bad Hotel (portrait only)
- Battlestation Harbinger
- Breach and Clear
- Bird Zapper
- Blackwell Legacy
- Block Legends
- Bloons TD 5
- Bridge Constructor
- Broken Sword
- Catan
- Cogs
- Color Sheep
- Contre Jour
- Crayon Physics
- Cubemen
- Cubemen 2
- Desert Bus
- Desert Golfing
- Desktop Dungeons
- Devil's Attorney
- Epoch
- Eufloria
- Exiles Far Colony
- First Strike
- Flight Control
- Fractal
- Framed
- Frozen Synapse
- Funky Smugglers
- Gemini Rue
- Governor of Poker
- Great Little War Game
- Grim Fandango
- Greed Corp
- Hero Academy
- Hundreds
- Ironclad Tactics
- Jack Lumber
- Kingdom Rush
- Little Inferno
- Machinarium
- Mahjong Butterfly
- McPixel
- Mountain (portrait only)
- Muertitos (portrait only)
- OLO (portrait only)
- Organ Trail
- Out There Omega
- Outwitters (portrait only)
- Pacman Kart Rally (couldn't get touch working either, stuck on menu)
- Partyrs
- Plants vs Zombies
- Polymer (portrait only)
- Prune (portrait only)
- Pulse
- Puzzle Quest 2
- Ridiculous Fishing (uses accelerometer, portrait only)
- rymdkapsel
- Shadowrun Returns
- Siegecraft Defender
- Sleep Furiously
- Small World 2
- Solar Flux
- Sorcery! 3
- SpaceChem
- SpellTower (portrait only)
- Spider: The Secret of Bryce Manor
- Splice
- Star Command
- Swords & Soldiers
- Superbrothers: Sword & Sorcery EP
- Surgeon Simulator
- Syberia
- Tetrobot and Co.
- The Inner World
- The Room
- Ticket to Ride
- Tiny Guardians
- Toast Time (portrait only)
- Topia World Builder
- Tower Dwellers
- Toy Defense Premium
- Waking Mars
- Trainyard (portrait only)
- Worms 2: Armageddon
- Zen Bound 2
- 2-Bit Cowboy (stuck on loading screen)
- Stealth Bastard Deluxe (crashes on launch)
- Thomas Was Alone (crashes on launch)
- Neuroshima Hex (stuck on intro screen)
- Ravensword Shadowlands (stuck on blank screen after selecting gamepad mode)