I'm trying to avoid duplication here, so I won't mention games which are already on the Game List. Or at the very least I will try to avoid it.
All of the games mentioned here are available on steam or will be once they are out.
- Ravenfield: Battlefield-esque single-player FPS which has been in development for a long time.
- Trepang 2: FEAR-inspired single-player FPS.
- RIPOUT: Coop-Horror-FPS
- Devilated: FPS with RPG-elements, calls itself a "boomer shooter".
- Spirits of Xanadu: Immersive Sim (currently on sale for pennies)
- HROT: Retro-FPS set in post-soviet setting, Quake-inspired
- Selaco: Story-FPS based on GZdoom
- Exocide: Retro-FPS apparently somewhat inspired by The Darkness
- Brutal Fate: Retro-FPS, I think the creator was involved in some Brutal Doom-mod or so.
- Vomitoreum: Metroidvania-FPS, Horror-themed
- Ultrakill: Retro-FPS, mentioned by another user, but not on list.
- GTTOD: Get To The Orange Door: "neon synthwave virtualscape FPS"
- Peripeteia: "first-and-third-person role-playing stealth game taking place in alt-history cyberpunk Poland. Inspired by immersive sims from Ion Storm and Looking Glass Studios"
- Fortune's Run: "high-octane first-person shooter with stealth and RPG elements"
- Brigand: Oaxaca: "highly difficult post-apocalyptic RPG/FPS set in Mexico"
- Cruelty Squad: "An immersive power fantasy simulator with tactical stealth elements set in a sewage infused garbage world"
- Golden Light: "Survival-Horror FPS"
- Post Void: "hypnotic scramble of early first-person shooter design that values speed above all else", very cheap.
- Ad Infernum: Horror adventure
- Armored Head: Small arena wave-based FPS
- Fibrillation HD: Same developer as previous game, journey through dark and strange environments, Horror-elements.
- Kairo: Atmospheric first person-puzzle game, abstract colorful environments.
- NaissanceE: journey through massive, brutalist environments, platforming elements, light-dark-dynamic. (is free at this point)
- Manifold Garden: First-person-puzzler with abstract environments.
- Bokida: Heartfelt Reunion: First person-open-world-puzzler with unique aesthetic, easy travelling and environmental "destruction".
- (not on Steam, basically Abandonware) Vivsector - Enemy Within: Arena shooter that eventually turns into a more linear shooter.
- (not on Steam, basically Abandonware) You are empty: Short FPS in the vein of Half Life 2, takes place in postapocalyptic soviet setting