Interstellar Marines
Interstellar Marines is an immersive tactical sci-fi First Person Simulator in the making, offering a unique blend of tactical gameplay, dynamic environments and non-scripted AI. Play Singleplayer or Co-op/PvP on servers around the world.
Interstellar Marines is inspired by movies such as Aliens, Starship Troopers and Saving Private Ryan; and games such as Half-Life, Deus Ex, System Shock 2, and Rainbow Six 3: Raven Shield.
Interstellar Marines is all about evolving the FPS recipe with the inspirations we’ve assimilated since the birth of the genre. Our goal is an evolutionary leap forward driven by our compulsive interest in science fiction, role-playing, military realism, and respect for first person immersion.Interstellar Warfare InitiativeIt is the dawn of the 22nd century, a time of great hopes and expectations. The discovery of a new and inexhaustible well of power known as Zero Point Energy has revolutionized space travel. Man has escaped the confines of Mother Earth, and gone on to colonize the solar system.
But far away from public awareness an ambitious military project has already taken Man beyond the final frontier, and into the regions of the stars. The powerful Interplanetary Treaty Organization, ITO, is secretly constructing the first human settlement in another star system.
You are a special forces soldier training to join the Interstellar Marines, a part of the secret Interstellar Warfare Initiative being established to protect humanity against potential threats from the confines of the unknown universe.
It’s time to evaluate the Interstellar Warfare Initiative and program evaluations are taking place at The Vault, ITO’s most advanced military facility on Earth enclosed deep beneath Groom Lake, Nevada. Supervised by SARA, ITO’s central neural network AI, SARA will program artificial weather and advanced combat training robots to test each warfare initiative to the limits.
This is where the game begins …7 Singleplayer/Co-op MissionsPlay 5 co-op and single-player missions against unscripted AI with dynamic environment effects or two pivotal missions inside the Interstellar Marines universe, The NeuroGen Incident and Assault on Starcrown Aerospace. Play singleplayer or co-op with up to three friends in intense action with more co-op and singleplayer missions to come!Wargames (Sandbox Combat Arena)Unique sandbox combat arena in the making. Wargames is played across 9 distinct interconnected environment zones allowing 64 players to join in the scavenge for combat points, playing alone or in co-op. We have a special Wargames Steam Leaderboard which tracks Combat Points globally, monthly, and survivors of Wargames.
9 Unique Multiplayer Maps Across 3 Game ModesTake your friends out in Deadlock, Deathmatch, and Team Deathmatch on maps featuring dynamic environment effects such as time of day, rain, thunder and lightning, emergency lighting, fire alarms, moving platforms etc.Realistic SimulationWith a physics-based dynamic character controller there are no floating hands, and you can even see your feet! The physically present combat helmet has a HUD projected onto the visor and is affected by dust, rain, fogging, and damage. Aim down the sight for the long shots and use the tactical laser to assist aim when hip firing, as there are no artificial crosshairs to break immersion. Use the intuitive crouch and cover system; spacebar (default) peeks over cover, and looking down leans you forward to see over ledges. You can also shoot out the lights and prowl in darkness, or use the tactical flashlight if you’re afraid of the dark.
We hope you enjoy the game, and look forward to developing it with you as we progress through Early Access!
FOR THE LOVE OF THE GAME,
Your team at Zero Point Software
Game Discussion
Steam User 27
The Tactical Shooter That Could Have Been
This game arrived on the scene with immense potential—a tactical shooter set in the eerie confines of an abandoned space station, teeming with deadly robots. Its premise alone was enough to intrigue and excite players. At its best, the game delivered genuinely terrifying moments. The atmosphere was impeccable, with hauntingly immersive level design and weapon sounds that hit just the right notes. The tension of sneaking through dark corridors, always anticipating the next killer droid encounter, was nothing short of electrifying.
However, the developers—a small, ambitious team—made a critical misstep. Instead of doubling down on the cooperative missions and expanding the arsenal, they shifted focus to player-versus-player (PVP) gameplay. And frankly, that decision derailed what could have been a phenomenal experience. The cooperative missions were the beating heart of the game, offering moments of strategic teamwork that felt incredibly rewarding. Had the team prioritized new missions, enemies, and weapons, this could have been a GTFO "Light"—a standout in its genre.
Sadly, the game was left to languish and was ultimately abandoned. It’s disheartening to think of what could have been if the spotlight had stayed on the cooperative elements. Released today, it might have found an audience among gamers who crave intense, atmospheric co-op experiences.
That said, I still have fond memories of playing solo, sneaking through levels and dismantling droids one by one. The stealthy thrill of it all provided hours of entertainment. But as it stands, this game is a relic of untapped promise. If it were made free-to-play, it could potentially reignite interest, allowing new players to explore its haunting world. But for now, it’s not worth spending your money on. Fun times—but ultimately, a cautionary tale in game development.
Steam User 4
I was going down my games list and saw this. This game was very immersive with the helmet/hud tech, weather, and technical design. I wish the devs nothing but love and appreciate the good times.
Leaving a positive review because I got my moneys worth back in the day.
Steam User 9
It was a game destined for greatness, sad to see it fizzle out
Steam User 11
I miss this game. One of my favorites for sure, 2025 could use a spacey tactical milsim. I loved it a lot
Steam User 2
Positive
A lot of fun with friends.
There's a more horror focused part in singleplayer, which is fun.
Price is reasonable.
Negative
If you don't have friends, its gonna be trash.
Laggy as hell.
Pvp is bland as hell.
Steam User 0
Interstellar Marines is one of those rare indie shooters that aimed far beyond the usual scope of its genre, presenting itself as a tactical sci-fi FPS built on immersion, grounded mechanics, and a believable futuristic setting. From the very beginning, the game positions you as a marine in a world where humanity has begun to explore dangerous frontiers, with clandestine missions, research facilities, and military experiments offering constant tension. The ambition is clear: Interstellar Marines wants to blend the weight and pacing of old-school tactical shooters with the atmosphere of sci-fi horror and the cooperative teamwork of modern survival shooters. Even in its incomplete state, this ambition shapes every part of its identity.
The gameplay leans strongly toward realism and deliberate pacing. Your movement is measured, with sprinting, crouching, sliding, and leaning all contributing to a tactical feel. Weapons are intentionally grounded—pistols, SMGs, assault rifles—supported by attachments like suppressors, flashlights, and laser sights. Even aiming is affected by breathing and exertion, giving firefights a sense of physicality. The emphasis is less on run-and-gun spectacle and more on careful positioning and teamwork, particularly in co-op missions where you take on robotic enemies inside dim corridors or abandoned industrial spaces. In these moments, Interstellar Marines can deliver a genuine sense of dread, as your flashlight cuts through darkness and you listen for the mechanical clatter of approaching training robots.
This attention to atmosphere is one of the game’s strongest qualities. Missions such as The NeuroGen Incident showcase how effective the game can be at creating tension. You navigate flickering hallways, reactivate power systems, and rely on environmental cues to anticipate threats. The visual design is clean and sharp, favoring realistic lighting over flashy effects, while the soundscape—echoing metal footsteps, mechanical growls, distant alarms—does much of the heavy lifting in building suspense. When Interstellar Marines leans into its immersive horror elements, it feels like it could stand alongside bigger-budget sci-fi shooters despite being an indie effort.
Yet the game’s ambition is also what undermines it. Despite its long development timeline, Interstellar Marines never reached the fully realized vision the developers set out to create. The planned campaign trilogy, which would have fused narrative progression with tactical missions and RPG-style elements, never materialized in full. What remains is a collection of co-op scenarios, skirmishes, and multiplayer maps that, while functional, lack the depth and variety needed to sustain long-term engagement. Many of the systems feel like foundational pieces waiting for a larger structure that never arrived.
Multiplayer reflects this incomplete state as well. While the mechanics work and the shooting feels grounded, the content is limited and the player base is inconsistent. Matches can be enjoyable when lobbies are active, but long queue times or empty servers often break the momentum. Similarly, co-op missions can be tense and rewarding, but the small pool of available scenarios means repetition sets in quickly. Interstellar Marines offers a taste of something bigger, but rarely delivers the breadth needed to keep most players invested.
Technical performance and polish vary. The developers made significant efforts—such as upgrading the engine and patching bugs—to keep the project alive even when funding dwindled, and that dedication is admirable. Still, the game retains an uneven feel. Occasional performance drops, stiff AI behavior, and inconsistent balancing are reminders of its unfinished nature. Interstellar Marines often feels like a promising prototype rather than a fully completed release, and while its bones are strong, the flesh around them remains thin.
Despite all of this, Interstellar Marines retains a strange appeal. Its atmosphere is compelling, its grounded mechanics feel refreshing in an era of hyper-fast shooters, and its cooperative missions—when experienced with the right group—can produce genuinely memorable moments of tension and teamwork. It stands as a testament to indie ambition, even if it also represents the risks of aiming too high without the resources to finish the journey.
In the end, Interstellar Marines is a game best suited for players who appreciate its vision enough to overlook its incompleteness. It is not a fully realized tactical shooter or an expansive sci-fi campaign, but it offers glimpses of what could have been: a dark, immersive, and thoughtful blend of realism and science fiction. For those willing to explore its limited but atmospheric content, it can still provide intense and atmospheric play sessions. For anyone seeking polish, variety, or a complete experience, however, Interstellar Marines is more a story of ambition than fulfillment.
Rating: 5/10
Steam User 0
There are people who should be ashamed of not liking this game. It's not a great game, but it's better than many games that have come out over the past six years. I was there as a player from the beginning and throughout the process. The ZPS team really tried to achieve something. It was left unfinished. The fact that the servers are still open and that an average of four people, including me, still play the game occasionally makes me happy. Its AI is better than most games. It could have been better.
I still have hope. One day, a publisher will step up and do what it takes to revive this game.
Believe me, if I had a big company and was rich, I would rehire every developer who worked on this game and make sure it was completed.
Until then, I hope those who own this game will log in and play it from time to time.