Top similar games like Mailstrom:

INFESTSTATION is a multiplayer Sci-Fi horror game. Board danger-filled abandoned space craft, work together to complete objectives, and sever the dimensional gateways that have allowed horrifying threats to take over and infest these now derelict spaces.

DEEPWATER is a frantic co-op horror game about working together to scavenge resources from a giant abandoned building.

A multiplayer adventure set in the depths of space. Unravel mysteries, strategize for survival, and explore the unknown in this captivating cosmic escapade.

Damned is a randomized online horror game for up to 5 players (4 survivors and 1 monster). You’ll be able to play as one of four people trapped in different haunted places (hotels, hospitals, etc).

Online co-op horror for 1-4 players. Mine nearby asteroids for gems to pay for your new company's spaceship. Time your orbits, daytrade the minerals market, and avoid deadly monsters at night. Create your own public or private server and see how many days your crew can survive!

An online co-op horror game with up to 6 players. Locate valuable, fully physics-based objects and handle them with care as you retrieve and extract to satisfy your creator's desires.

Explore new planets and civilizations. Turn in precious artifacts to the management company and get rich financially!

Half dead is a multiplayer sci-fi game about a violent TV show. The players' goal is to survive in a network of rooms full of traps.

A co-op game about exploring dangerous planets with your teammates, collecting and selling scrap metal to survive from the corporation. Assemble your own robot to help your team in your own way. Never be a “rusty coffin”.

Blind Descent is a multiplayer open-world survival adventure game with up to 4 players set in the Martian underground.

In Specimen 13 you play as one of five survivors (or a traitor) who find themselves as unwilling subjects in an experiment set on a mysterious island. Alternatively, play as the Specimen and prevent the survivors from escaping through the underground elevator.

Stealth will be your only defense in this 1-4 player Sci-fi horror scenario while you attempt to escape an ever learning AI. Be quiet, stay hidden, and remain calm, or face certain death.

Dungeon Done is a PvE co-op horror survival extraction game where players explore dungeons previously cleared by heroes. The objective is for up to six players to team up, gathering hidden treasures and evading lurking dangers to make their daring escape.

Under Lock is a multiplayer asymmetrical PvP horror game for 5 players (4 survivors versus 1 monster). Take the role of a survivor with the goal to outsmart the monster and escape from lockdown. Or choose one from several unique monsters to hunt down and devour the victims.

Put on your thermos bags and head outside with your friends. You will have to deliver food to the aliens and make sure that the last company on Earth does not close down.

A co-op horror about searching the depths of the ocean for treasure.

Backrooms: Extractions is a 1-6 player co-op horror game set in 2062. As a MEG operative, enter the Backrooms to locate and extract lost agents while evading lurking entities. Use advanced tools, solve tense puzzles, and survive eerie environments. Stay alert: every sound could be your last!

Pamali: The Vengeful Mother is a 1-4 players online co-op survival horror. Use each character’s unique strengths, strategize with your teammates, do everything you can to save the missing children and escape the abandoned orphanage. Bring your friends!

Don't Drop Dead is a session-based cooperative extraction game played in first-person perspective. Abandoned scientific facilities are already awaiting stalkers hungry for artifacts, but beware—these places can change the rules of the game at any moment... as can you yourself. Or your teammate.

NEMESIS DISTRESS is a unique multiplayer Sci-Fi horror experience that aims at creating unforgettable, cinematic moments. Remember – this is NOT a shooter, in Nemesis you are not the hunter. You are the PREY.

A co-op survival horror for 1–4 players — deliver cargo, stay alive, and trust no one for too long.

A 4 player co-op horror where you answer distress calls and board spaceships in search of survivors.

Enjoy a 4vs1 asymmetric horror experience like no other. Be a part of the investigator team, or take control of the creature and devour them!

CHAINED BACKROOMS is a horror game where players are chained together, forced to survive and explore procedurally generated Backrooms levels. Only coordinated teamwork can help avoid dangers and find an escape. Co-op for 1-4 players.

Inside the Backrooms is a horror multiplayer game mixed with different mechanics that will make you spend an intense night with friends. Explore, think, interact, but be careful, it is rumored that there are several entities wishing to find you...

In a post-apocalyptic world overrun by monsters due to an unknown virus, some people have managed to survive. During these times, an organization formed by elite members of society emerged, fighting against the monsters and aiming to restore the world to its original state.

Backrooms: The Deep Dark is a 4-player cooperative horror game where you will survive in a mysterious scary atmospheric world, wander through unknown dark corners and get scared of every nook and cranny!

FOREWARNED is a 1-4 player co-op survival horror. Delve deep into ancient Egyptian ruins with your team of fellow archaeologists. Investigate phenomena, collect treasure, discover lore, survive danger, and banish the evil that lurks within.

Venture forth as part of a specialized team of fellow players tasked with retrieving classified materials, evading the black goo virus, and the nightmarish entities it has spawned. With time running out before the US government initiates a devastating nuclear strike to contain the spreading menace.

In this online horror co-op, you play as a scrappy goblin, scavenging dungeons, dodging traps, and fleeing monsters to feed the Goblin King. Team up with goblin pals, or go rogue, as you dive deep and cause chaos! Fail to feed him, and you might be the next meal!

OopsFixers Company is a cooperative action game for up to 4 players where you work in a team to fix extreme situations that other companies avoid. Control unique characters. Collaborate with your teammates. Improve your team to be ready for the impossible.

Survive relentless entities, solve mind-bending puzzles, and uncover the dark secrets of your surroundings. With an XP system, crafting, and resource management, every decision matters. Will you find your way out—or become another lost soul?

A co-op horror looting game about exploring luminal spaces, evading monsters, gathering valuable loot and selling it to meet the quota

Chained in the Backrooms is a 1-4 player co-op, mission-based horror game. Trapped in a blurry subconscious and chained together, toy bears must solve puzzles, complete challenging missions, and survive against creatures trying to destroy them.