Top similar games like The Sirius Device:

Star-Coat is a third person shooter where you dive into procedurally generated maps to fight corrupted enemies and the bosses that command them. Outfit your pilot and your COAT, a fearsome walker, with a variety of weapons and armor to help you defeat evil in the universe.

Kanka is a 1–4 player co-op sci-fi action RPG / third-person shooter. Complete dangerous missions on SP-01, fight hostile factions, explore dangerous regions, craft key tools, progress your character, and work together to find a way home.

A third person, sci-fi, looter shooter. Reclaim earth from robotic enemies. Level up, gain skill abilities, and fight for the right of our very existence.

EVERSPACE 2 is a fast-paced single-player spaceship shooter with exploration in space and on planets, tons of loot, RPG elements, mining, and crafting. Experience an exciting sci-fi story set in a vivid, handcrafted open world full of secrets, puzzles, and perils.

Star Vortex is a fast paced Action-RPG inspired by classics of the genre. Design your ship, fight your way through hostile alien sectors, upgrade as you salvage rare weapons and experiment with different builds until nothing can stand against you.

Hatch, evolve, and upgrade powerful space creatures in this action-packed sci-fi 3rd person shooter that reinvents the monster taming genre!

Break Free is a fast paced third person sci fi shooter game. The creatures that live among us have made the Earth uninhabitable for human life. You are mankind's best hope for survival. Make no mistake, war is coming and you shall die today, then you shall live to fight again tomorrow.

SPL is a genre mix of fast paced looter shooter, souls-like and 3D space sim, with realistic physics dogfights.

A sci-fi space vehicle combat game, where the player must defend their capital ship from being destroyed, while attempting to destroy the alien force's own capital ship!

Awaken as an unstoppable warrior and battle alongside your friends in this story-driven free-to-play online action game

Shoot at enemies in a WEIGHTLESS space station to save yourself from burning alive in the atmosphere!

Hellforged is a loot-driven, extraction bullet-heaven game. Fight through demon-infested maps, pre-craft your build, hunt powerful gear, and combine abilities into epic synergies. Every run is a tense heist. Safely extract epic gear mid-battle or risk it all for greater rewards!

Holomento is an Indie Permadeath Action-RPG focusing on the dangerous quest of passing through the mysterious Eventide Hollow – and rebuilding it step by step.

A solo PvE extraction shooter set inside a droid factory that never stopped running. Loot the Myrmidons, escape with your gear — or lose it all.

Praedatum is a fast-paced top-down Extraction Shooter set in the dystopian world of tomorrow. Our future has been stolen by evil robotic overlords. As a legendary Warrior from the distant past, your job is to steal it right back!

Project Rocket is a Hack & Slash game set in a futuristic universe. Play as a member of an elite unit of space soldiers, equipped with the latest human technology, and take on the hordes of aliens invading the colonies.

Deploy to a war-torn sci-fi island in Blackfall: Cyborgs Down, a high-intensity third-person looter shooter. Customize 18 Valor Cyborgs across 4 classes, master 60+ weapon models, and a 67-node skill tree. Then, trigger the turn-based 6v6 Prime Battle mode to collect and upgrade heavy mechs.

Upgrade your power armor, recruit a loyal crew, and build a spaceship to escape the oppressive management of a dystopian barren planet. Breakers world features open-ended sci-fi RPG character development in a unique world full of rust, danger, and opportunity.

Dive into a minimalist sci-fi war! Fuse Action Shooting with Strategic Command. Control powerful Star Generals in bullet-hell combat or lead Star Trooper armies to defend your base. Explore the Starmap, upgrade units, and save the Interstellar Bay in a dazzling geometric universe.

Infiltrate the remnants of a fallen empire, extract valuable loot, establish defenses against hostile fanatics, and unlock the gateway to a dimension of cosmic dread that defies comprehension.

Take on the role of sci-fi warrior Maya. Capture uplinks, master a complex move-set along with weapon upgrades, and survive on a hostile planet.

This is an anime-styled 3D third-person shooter that seamlessly blends real-time combat with loot mechanics. It features a diverse weapon system including a wide range of distinctive firearms and melee weapons, with combat enhanced by characters' elemental specialty skills.

This game is a sci-fi action role-playing game From assembly to painting, you can greatly customize your character

2040 World is a free-to-play third-person MMO action game with extraction-based gameplay. You play as a mercenary operator, remotely controlling synthetic avatars used by powerful transnational corporations to explore a vast artificial megastructure simply known as The Station.

Overvoid - is a dark sci-fi third-person space-combat roguelite. You are a starship pilot trapped in an endless cycle across hostile space sectors. Fight relentless enemy waves, experiment with builds, gather resources, and unlock weapons, ships, and modules to break the cycle.

Battle For The Droid Station is a RPG shooting game now available on Steam. Feel the adrenaline as you run and gun down hundreds of rogue mechs and droids causing mayhem on the space station. Take control of your droid character and try to clear the space station from invading droids and robots.

KNOW YOUR ENEMY. FIRE YOUR CANNONS. A spaceship management and combat game. As the Captain of Silver Wolf, command your crew and use your energy strategically. Change your future with your decisions. Arm your ship and strengthen its shields. Survive in the solar system full of dangers.

Pixelorbit is a Space ARPG about loot, progression and building your own combat ship. Fight through hostile sectors, explore an MMO-inspired galaxy, collect 500+ items and combine Extras, Mods and Passives into powerful endgame builds.

An indie action-RPG where you pilot customizable ships through side-scrolling combat, level up unique characters, and dismantle a corrupt galactic regime one mission at a time.

Aphelion Headhunters is a Third-Person PVE Hero Shooter featuring two unique player characters, each with their own distinct playstyle, abilities and suite of selectable upgrades.

A sci-fi action RPG. Battle alien hordes with fast-paced combat, evolving weapons, and a combat drone companion. Upgrade your arsenal, defeat challenging bosses, and explore a hostile alien world.

Beyond Polaris Guardian is a action-rpg and TPS on a flexible campaign system with different stories. Incarne 3 unique characters and develop your personal story thanks to the innovative Galactic Network system.

Astro Combat is a Pixel Space Shooter, with Action-RPG elements.