Top similar games like OSIRIS:

A fast-paced First Person Shooter inspired by the classics of the genre. Shoot and kick your way out of the war-torn planet to survive the attack of the space undead. Zombie blood has never splashed so good!

Relive Half-Life.

Hell’s armies have invaded Earth. Become the Slayer in an epic single-player campaign to conquer demons across dimensions and stop the final destruction of humanity. The only thing they fear... is you.

Cosmic VR Action Horror focusing on intense shooter action, twisted sci-fi anthology stories and disturbing atmospheric dread. You’re marooned alone in the Bermuda triangle of space, filled with ancient derelicts and ravenous aliens: By Grit Alone, you will survive.

Now includes all three premium DLC packs (Unto the Evil, Hell Followed, and Bloodfall), maps, modes, and weapons, as well as all feature updates including Arcade Mode, Photo Mode, and the latest Update 6.66, which brings further multiplayer improvements as well as revamps multiplayer progression.

Half-Life Deathmatch: Source is a recreation of the first multiplayer game set in the Half-Life universe. Features all the classic weapons and most-played maps, now running on the Source engine.

Exocide from Apogee (Duke, Turbo, Prey, Max). Humans made superbugs to fight as soldiers. And the bugs turned against us. You're the last Handler, a human+AI robotic team with 4 total arms capable of welding 4 weapons, or one HUGE gun. Stop the super swarms before total human extinction.

Of Lies and Rain is a story-driven first person shooter built exclusively for VR. Set in a dark, sci-fi, post-apocalyptic world, at the edge of the real and digital realm. You’ll fight to reclaim your past and save humanity from the brink of extinction.

Dark Places is a psychological single-player game set in a surreal world filled with horrific creatures and nightmarish delusions. Solve puzzles and try to survive.

IMHA is a first-person shooter set on an island ravaged by a demon invasion. Battle your way through endless hordes of enemies and survive the onslaught of relentless ghouls and demons.

You are following the story of security guard working at power plant which uses experimental technology, designed to draw electricity from atmosphere. One day you start hearing strange stories about anomaly sightings, soon you witness something terrifying...

Buried Alive: The Annihilation is an immersive and intensive VR shooter. Survive and uncover the truth in the Annihilation!

Gynophobia is a horror themed shooter about abnormal fear of women. Gynophobia is using classic first person shooter gameplay, to convey story about Mark, who is suffering from different phobias, including abnormal fear of woman.

MUTATION PHASE is a horror-shooter with a first-person view, which narrates the consequences of experiments with sound waves. You have to survive among hordes of mutants and get out of the danger zone.

Space Amazons! Cosmic Horror! Action!

Become the ultimate badass in Trepang2: A gory, action-packed FPS set in the near future. Unleash all hell on your enemies, dodge bullets and leave a trail of destruction in this hardcore and frenetic shooter.

This Strange Realm Of Mine is a First Person Shooter mixed with poetry and psychological horror. Graphic style is 3D mixed with pixel art.

Enter this first-person shooter with dark and realistic scenarios, use your shooting skills to kill all the enemies and survive. Explore the scenario and collect all the resources you can because you will need them to get out alive.

As part of the elite Rhino Squad, you must spearhead Earth’s military invasion of a hostile alien homeworld. But, in this desperate war for humanity’s survival against an unrelenting enemy, you may discover that the only way to defeat them...is to become one of them.

Join BRUTAL JOHN and BRUTAL DOG in a ultraviolent old-school FPS set in a world overrun by crypto-mining technologies, where it’s up to you to destroy them and reclaim control. Prepare for an adrenaline ride that pays homage to the best shooters of the '90s.

Once again, you are on board Shakhter-One. Traverse the deck of a well-known mining ship and the depths of Mark's twisted mind blended together. Run, fight, hide, explore – discover, what really happened to this place and do your best to destroy Shakhter-One.

Half-Life: Alyx is Valve’s VR return to the Half-Life series. It’s the story of an impossible fight against a vicious alien race known as the Combine, set between the events of Half-Life and Half-Life 2. Playing as Alyx Vance, you are humanity’s only chance for survival.

Step into the boots of Grayson Hunt after a crash landing on an old resort planet forces him to make a hard choice: survival or revenge. Execute masterful kills with Bulletstorm: Full Clip Edition’s unique combat system that rewards you for performing the most creative and deadly kills imaginable.

DelayedSun is a third-person shooter survival horror game set in a post-apocalyptic world filled with flesh-hungry zombies. Craft items, gather resources, upgrade your skills and prepare your gun to fight!

In this cute cardboard world, something went horribly wrong... You wake up in a prison cell. A strange voice calls to you from the depths of dark corridors covered in runic symbols and blood. Reload your trusty shotgun and find out... WHY WOULD CARDBOARD... BLEED?

【Can you live with this fear?】 A horror game developed by a Japanese high school student all by himself is coming to Steam! Escape the monster's pursuit in the creepy mansion, sometimes using weapons to fight back and find the key to escape!

You & your friends are the deadliest killers in the galaxy – the US Colonial Marines. It’s up to you to not just survive, but wipe out the Xeno infestation.

The space station suffered an unknown infection from space, the previously unknown X virus mutates, almost the entire crew of the station is infected, you need to stop the army of mutants until they break through to Earth and the judgment day begins!

Survive or die ! Experience survival horror full of puzzles while escaping between the streets of Algeria after zombies invasion . Suffer to protect your life in situations never attempt them before with first person perspective and powerful actions that make it more realistic then ever

Putrefaction is a First Person Shooter with horror elements, lots of enemies and weapons, heavily inspired by old-school shooter classics.

Winner of over 50 Game of the Year awards, Half-Life set new standards for action games when it was released in 1998. Half-Life: Source is a digitally remastered version of the critically acclaimed and best selling PC game, enhanced via Source technology to include physics simulation, enhanced effects, and more.

In this game you have to fight your way through hordes of zombies in search of a safe place.

You are Isaac Clarke, an engineer on the spacecraft USG Ishimura. You're not a warrior. You're not a soldier. You are, however, the last line of defense for the remaining living crew.

Red Lake - horror shooter with elements of quest.

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.