Top similar games like The Citadel:

Perilous Warp is a fast-paced indie retro-shooter inspired by the classic 3D-actions. Communication with a distant space colony has been lost, and you bravely step into the teleporter with the desire for glorious adventures. But do not expect to win in a heartbeat!

Prepare for terror in this ground-breaking classic old-school FPS. Following the destruction of Time you are left to battle in this horrific hellhole of multilevel interconnected missions populated by gruesome grotesque creatures.

3D Realms, creators of Duke Nukem 3D, Prey, and Max Payne, are excited to team up with Voidpoint to bring back the legendary Build Engine, famously known for classic first-person shooters like Duke Nukem 3D, Shadow Warrior, and Blood. Ion Fury is the real deal!

V.R.G. is a FPS cross between a retro-style and a modern-style , Defeat enemies and get combos to improve operability, and eat scatter pieces of meat to recover.

Zombies Must Die is a gloomy retro FPS featuring dozen handcrafted levels, a lot of zombies, and deadly weapons (crossbow included!). Do you aim good enough to headshot them all?

The Apogee Throwback Pack is a collection of four classic Apogee Software titles all in one kick ass package. Blast your way across the galaxy as British Special Agent Blake Stone in "Aliens of Gold" and "Planet Strike", then take on an ancient evil menace as the H.U.N.T in "Rise of the Triad".

HROT is a single-player retro FPS set in a small socialist country neighboring Soviet Union (Czechoslovakia) after an unspecified disaster in 1986. Those times were dark and terrifying and so is the game.

Arthurian Legends is a medieval first person action game set in the land of Albion during a time of myth and legend. Battle hordes of Saxons, demonic beasts, the undead and worse in thy quest to save Albion from The Masters of the Old Religion.

Classic First Person Shooter style game. Like the good old days. An action game focused on speed, gore, guns, and metal music. Inspired by the 90s’ classics with modern visuals and audio!

Prodeus is a first-person shooter of old, re-imagined using modern rendering techniques and technology. Experience the quality you’d expect from a modern AAA game, designed with retro aesthetics and gameplay that invoke the tech-imposed limits of older hardware.

First person shooter. In the style of famous games like Doom, Quake, Duke Nukem and Call of Duty. You have to play as the only survivor after the crash of the pilot of a combat helicopter, fighting with a huge army of enemies. Improve your skills and upgrade your weapons. All in your hands.

Breach enemy stronghold in dread Siberian wastelands before insurgents can open gates to Samozbor dimension.

COP BASTARD - is a old-school classic first-person shooter inspired by action movies from the 90s, takes place in the early 90s in Japan.

You’re a marine—one of Earth’s best—recently assigned to the Union Aerospace Corporation (UAC) research facility on Mars. When an experiment malfunctions and creates a portal to Hell, the base is overrun by blood-thirsty demons. You must shoot your way out to survive.

KARM brings back '90s FPS look and feel in a lovecraftian world. Try to discover what lies behind the cult and make sure you don't lose your sanity!

Brutal Fate is a fast-paced ultra-violent retro first-person shooter inspired by 80's and 90's sci-fi movies. It blends the best features of classic shooters with some modern aspects, making it an unique mix.

A new old first person shooter. Shoot cultists and escape from their compound before they summon a demon that ends the world.

CRIMSON METAL - Far from Perfect, brutal and merciless.

Hatchpunk is a retro first person shooter with unique visual style. You have a gun in one hand and a chainsaw in other hand. So come out and face the hordes of monsters that have invaded Earth. Use grapple hook for efficient movement. Kill enemies in close combat with chainsaw to regain your health.

Blast, slice and shred through your enemies in this hardcore FPS inspired by the icons of the '90s, powered by the legendary Quake-1 Tech. Taking place in a realm left to rot, take up arms, unearth long-forgotten secrets and hunt down the Guardians of the Old World.

Death is only the beginning. Crawl from your grave and gear up to fight your way through the ranks of a mysterious and twisted cult. You, your guns, and your dynamite will have to shoot, slide, blast, duck, dodge, and maybe throw a gib or two to survive in this old-school-inspired shooter.

Only Lead Can Stop Them is a retro FPS set in the Spanish Civil War. Fight the Fascist Hordes!

Explore the gloomy rooms of a sci-fi base as a doomed marine, the sole survivor of the portal experiment. Save humanity as you did in the 90s with your trusty shotgun, make your way through ominous corridors inhabited by the shadows of sinners and evil spirits.

Load up your Boltgun and unleash the awesome Space Marine arsenal to blast your way through an explosion of sprites, pixels and blood in a perfect blend of Warhammer 40,000, frenetic gameplay and the stylish visuals of 90’s retro shooters.

Experience the Half-Life™ expansion packs like never before. Operation: Black Mesa features reimaginings of both Half-Life™ Opposing Force and Half-Life™ Blue Shift through two unique campaigns. How will you survive the Black Mesa Incident? It's time to choose.

A SHORT and sweet pixelated low fidelity 90s throwback hyper-fast action shooter. Survive and fight through a city overrun with manufactured monstrosities, biomass horrors, and a military authority trying to purge everything living. Featuring a heavy metal / techno soundtrack

You are part of an elite group of operatives called HUNT (High-risk United Nations Taskforce), and you must stop a maniac cult leader from killing millions of people. While scouting a remote island, you are suddenly surrounded by enemy troops with guns blaring.

Within the Cosmos is a single-player first-person sci-fi RPG. You awaken from cryogenic sleep, and shortly after, you and your crew get attacked by an unknown enemy. As you explore multiple planets to try to find answers, your choices and actions will determine how the story unfolds.

Turbo Overkill is complete and with many new updates (just in: spectacular ending credits). Clean up Paradise with your chainsaw leg, 15+ weapons & hovercar, and battle Syn (a super AI), bounty hunters, and cyberpunks aplenty. Apogee's most outrageous FPS since Duke Nukem 3D. Good hunting, Sir!

Forgive Me Father is a dark retro horror FPS set in a comic book style world inspired by the novels of H.P. Lovecraft. As the only one left with full senses, you begin a journey in search of answers and relief. How long can you last?

Dino Trauma introduces you to a secret laboratory somewhere in eastern Europe where gore and dinosaurs isn't unusual thing. Retro FPS inspired by the '90s legends.

Eastern Europe is the newest Circle of Hell, but outside its walls things aren't much better. Relentless action, pixelated gore, 256 colors. That is Delilah. And yeah, it is inspired by other shooters starting with a 'D'.

A classical FPS based on movement filled with metroidvania elements and power ups to find by exploring the interconnected levels.