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- SiralimReleased: April 24, 2015Developer: Thylacine Studios
- Son of NorReleased: April 27, 2015Developer: Stillalive studios
- Broken AgeReleased: April 28, 2015Developer: Double Fine
- Shadowrun Chronicles: Boston LockdownReleased: April 28, 2015Developer: Cliffhanger Productions
- VerdunReleased: April 28, 2015Developer: BlackMill Games, M2H
- Sky ForceReleased: April 29, 2015Developer: Infinite Dreams
- Sky Force AnniversaryReleased: April 30, 2015Developer: Infinite Dreams
- Hollywood VisionaryReleased: May 2015Developer: Choice of Games
- The Adventures of TreeReleased: May 2015Platforms: Microsoft Windows, macOS, Linux
- Lux DeluxReleased: May 1, 2015Platforms: Microsoft Windows, macOS, Linux
- SnakebirdReleased: May 4, 2015Developer: Noumenon Games
- High StrangenessReleased: May 6, 2015Platforms: Microsoft Windows, macOS, Linux, Wii U
- YomiReleased: May 8, 2015Developer: Sirlin Games
- WindwardReleased: May 12, 2015Platforms: Microsoft Windows, macOS, Linux
- Love at First SightReleased: May 18, 2015Publisher: Sekai Project
- BlockstormReleased: May 21, 2015Platforms: Microsoft Windows, macOS, Linux
- WyrmsunReleased: May 22, 2015Engine: Stratagus
- 60 Seconds!Released: May 25, 2015Developer: Robot Gentleman
- Heroes of LootReleased: May 25, 2015Developer: Orange Pixel
- Dying Light: The Bozak HordeReleased: May 26, 2015Series: Dying Light
- Crash Drive 2Released: May 28, 2015Developer: BlackMill Games
- Alter WorldReleased: May 29, 2015Platforms: Microsoft Windows, macOS, Linux
- Lunch Truck TycoonReleased: May 29, 2015Platforms: Microsoft Windows, macOS, Linux
- 12 Labours of Hercules II: The Cretan BullReleased: June 2, 2015Developer: Jetdogs Studios, Zoom Out Games
- The Enchanted Cave 2Released: June 3, 2015Platforms: Microsoft Windows, macOS, Linux
- Supercharged Robot VULKAISERReleased: June 4, 2015Platforms: Microsoft Windows, Linux
- You Must Build a BoatReleased: June 4, 2015Developer: EightyEight Games
- BaronyReleased: June 23, 2015Platforms: Microsoft Windows, macOS, Linux
- Batman: Arkham KnightReleased: June 23, 2015Developer: Rocksteady Studios
- Centauri SectorReleased: June 24, 2015Engine: Construct
- It's Killing TimeReleased: June 27, 2015Developer: Choice of Games
- Energy BalanceReleased: July 2, 2015Developer: Sometimes You
- Deadlands Noir - That Old Time ReligionReleased: July 3, 2015Platforms: Microsoft Windows, macOS, Linux
- PromptReleased: July 6, 2015Developer: Peter Gutenko
- Skullgirls: 2nd EncoreReleased: July 7, 2015Developer: Hidden Variable Studios, M2, Lab Zero Games
- AR-K: The Great EscapeReleased: July 14, 2015Developer: Gato Studio
- A Mass of DeadReleased: July 15, 2015Platforms: Microsoft Windows, macOS, Linux
- AmygdalaReleased: July 15, 2015Platforms: Microsoft Windows, macOS, Linux
- Axis Football 2015Released: July 15, 2015Platforms: Microsoft Windows, macOS, Linux
- Champion of the GodsReleased: July 17, 2015Developer: Choice of Games
- No Time To Explain RemasteredReleased: July 17, 2015Platforms: Microsoft Windows, macOS, Linux
- Samurai of HyugaReleased: July 17, 2015Developer: Hosted Games
- Stranded In TimeReleased: July 17, 2015Platforms: Microsoft Windows, macOS, Linux
- WORLD END ECONOMiCA episode.02Released: July 21, 2015Publisher: Sekai Project
- 9 Clues 2: The WardReleased: July 23, 2015Developer: Artifex Mundi
- ZenzizenzicReleased: July 23, 2015Publisher: Adult Swim Games
- CradleReleased: July 24, 2015Developer: Flying Cafe for Semianimals
- GalacideReleased: July 28, 2015Developer: Puny Human
- Corpse Party: Blood Covered Repeated FearReleased: July 30, 2015Series: Corpse Party
- Siege WarsReleased: July 30, 2015Developer: RunServer
- Cursed SightReleased: August 3, 2015Platforms: Microsoft Windows, macOS, Linux
- Twin RobotsReleased: August 4, 2015Platforms: Microsoft Windows, macOS, Linux, Wii U
- 12 Labours of Hercules III: Girl PowerReleased: August 7, 2015Developer: Jetdogs Studios, Zoom Out Games
- Celestian Tales: Old NorthReleased: August 10, 2015Publisher: Digital Tribe
- GunnheimReleased: August 10, 2015Platforms: Microsoft Windows, macOS, Linux
- UBERMOSHReleased: August 13, 2015Platforms: Microsoft Windows, Linux
- Bard’s GoldReleased: August 14, 2015Platforms: Microsoft Windows, macOS, PlayStation Vita, Linux
- Sakura BeachReleased: August 14, 2015Developer: Winged Cloud
- Big Thinkers KindergartenReleased: August 18, 2015Developer: Humongous Entertainment
- RPG MOReleased: August 18, 2015Platforms: Microsoft Windows, macOS, Linux
- Warlocks vs ShadowsReleased: August 19, 2015Publisher: One More Level
- DiscStormReleased: August 20, 2015Platforms: Microsoft Windows, macOS, Linux
- Shadowrun: Hong KongReleased: August 20, 2015Developer: Harebrained Schemes
- VERSUS: The Lost OnesReleased: August 21, 2015Developer: Choice of Games
- Universe Sandbox 2Released: August 24, 2015Developer: Giant Army
- ShutshimiReleased: August 25, 2015Publisher: Choice Provisions
- Exile’s EndReleased: August 31, 2015Platforms: Microsoft Windows, macOS, Linux
- TinertiaReleased: September 3, 2015Platforms: Microsoft Windows, macOS, Linux
- A Wise Use of TimeReleased: September 4, 2015Developer: Choice of Games
- Broken Sword 5: The Serpent's CurseReleased: September 4, 2015Developer: Revolution Software
- Fault Milestone TwoReleased: September 8, 2015Developer: ALICE IN DISSONANCE
- Queen's Quest: Tower of DarknessReleased: September 10, 2015Developer: Brave Giant
- Sakura Swim ClubReleased: September 11, 2015Developer: Winged Cloud
- Simply ChessReleased: September 11, 2015Platforms: Microsoft Windows, macOS, Linux
- Rogue ContinuumReleased: September 15, 2015Platforms: Microsoft Windows, macOS, Linux
- Train ValleyReleased: September 16, 2015Developer: Flazm
- I Can't Escape: DarknessReleased: September 17, 2015Platforms: Microsoft Windows, macOS, Linux
- Shmup Love BoomReleased: September 18, 2015Platforms: Microsoft Windows, macOS, Linux
- Templar BattleforceReleased: September 21, 2015Engine: Cocos2d-x
- Dark Heritage: Guardians of HopeReleased: September 24, 2015Developer: The House of Fables
- VilmonicReleased: September 24, 2015Developer: Bludgeonsoft
- Game Corp DXReleased: October 2, 2015Developer: Endless Loop Studios
- PolychromaticReleased: October 2, 2015Developer: Brushfire Games
- Ratings WarReleased: October 2, 2015Developer: Choice of Games
- 1pxReleased: October 4, 2015Developer: Ulysse Ramage
- InventioneersReleased: October 5, 2015Platforms: Microsoft Windows, macOS, Linux
- Prison ArchitectReleased: October 6, 2015Developer: Introversion Software
- Fairy Tale Mysteries 2: The BeanstalkReleased: October 8, 2015Developer: Gogii Games
- Goggles - World of VaporiaReleased: October 9, 2015Platforms: Microsoft Windows, macOS, Linux
- MasochisiaReleased: October 9, 2015Developer: Oldblood
- Animal GodsReleased: October 12, 2015Platforms: Microsoft Windows, macOS, Linux, Wii U
- Orion TrailReleased: October 12, 2015Developer: Schell Games
- The Jackbox Party Pack 2Released: October 13, 2015Developer: Jackbox Games
- SkyscrappersReleased: October 15, 2015Developer: Ground Shatter
- CeresReleased: October 16, 2015Publisher: Iceberg Interactive
- Color Symphony 2Released: October 16, 2015Developer: REMIMORY
- Eternal StepReleased: October 16, 2015Publisher: Green Man Gaming Publishing
- BroforceReleased: October 17, 2015Developer: Free Lives
- Kingdom: ClassicReleased: October 21, 2015Publisher: Raw Fury