Top similar games like SIRIUS-4:

Advanced Space Flight, Combat, Trading, and Exploration Simulation. Set in a vast explorable universe, Evochron Legacy offers freeform gameplay with many diverse objectives and paths to choose from.

In the distant future, the X universe faces a period of profound and irrevocable change. While the universe stumbles towards an uncertain future, countless adventures await as new enemies rise in search of power.

Become the Captain of an interstellar cruiser and journey across the galaxy to save the Republic. During your journey you will have to make important decisions, improve the weaponry of your ship and fight against numerous enemies.

In the far future, armadas from surrounding systems have suddenly waged war on Earth. You are a pilot from the Ares Squadron, flying the fastest, most dangerous crafts ever made. You're outgunned, outmanned, and strapped into a flying coffin.

Experience a 1:1 scale, procedurally generated universe with seamless exploration from planets to stars. Journey across the cosmos with zero loading screens and realistic Newtonian physics. Trade, fight, and survive in a post-apocalyptic galaxy where gravity is your only boundary.

Captain your own space ship and roam the galaxy in 3D in this tactical space simulator with tons of RPG depth ! Space has never looked so inviting - but images can betray...It has been two years since the end of the second Gemini war, the situation in the wartorn system is further from resolution than ever.

Out of cash, out of luck, out on the fringe. Juno Markev has a killer to tail, a debt to pay, and more trouble headed her way. Rebel Galaxy Outlaw takes place in a greasy, blue-collar world of outlaws, truckers, cops and thieves.

A space trading and combat game in an ever-evolving galaxy.

Galactic Command Echo Squad SE is a high-end and very challenging space/planetary combat game. It offers a thrilling campaign, instant action combat sessions as well as a sandbox mode allowing you to explore the game's universe while battling hostile Insurgent forces among others.

The ultimate space capital ship combat compendium is the evolution of hard core space combat sims. The only game of its kind currently in existence.

beyond.frontiers is an open-world space adventure with 30+ ships, 125+ sectors, and fully voiced stories. Trade, explore, or fight — your choices shape the galaxy as three empires clash and ancient secrets await discovery.

Subdivision Infinity is an immersive and pulse pounding sci-fi space shooter featuring stunning graphics and tight spaceship game play. Hunt down and destroy enemy spacecraft, crush capital ships, mine asteroids for rare minerals, and find blueprints to craft amazing new vessels!

Explore asteroid fields, trade rare resources, and upgrade your ship in Cosmic Miners. Navigate faction alliances, complete missions, and rise through the ranks in a dynamic space adventure where your choices shape your path to cosmic power.

Starlight Brigade is a realistic space action-adventure game with a precise combat system and full 6DOF controls. You command the Wayfarer, an aging light cruiser centuries past her time. Plot missile salvos, hunt down your enemy, design munitions, manage your crew, and send engineers to fix damage.

Alliance Tales is a linear, story-driven space combat sim inspired by 90s classics like Wing Commander and Tie Fighter. Take part in fast-paced space battles in a campaign that takes you on the hunt for a missing friend while foiling a plot to take over the Frontier Colonies.

Spaceship Pro Simulator. Strapped in and ready. One ship, one mission—survive the unknown. Enemies ahead, systems online. This is my journey through deep space, and I'm not going down easy.

Space Travellers is a unique open-world sandbox space simulator set in the year 2343. Travel the galaxy, trade, explore unexplored worlds, fight, build bases and factories, forge alliances and experience new adventures!

Space Battle VR is an action shooter set in space. It supports VR controllers to give you a real feel how it is to be a spaceship pilot. You can truly feel the cosmos with this game. Jump into an awesome adventure, help mankind, win a war, bring freedom and happiness to the universe. People need you!

PlanetDrop - A Tiny Space Adventure is a computer game where you command a spaceship in an orbit of a planet. Your primary task is to capture "drop zones" with your shuttles and commandos. You rely on stealth, agility and speed, rather than on firepower.

A single-developer passion project. A seamless full scale solar system. Thrilling action. Be part of an incredible journey as a Universe is built from the ground up!

A must for any fan, Star Trek: Starfleet Academy is an action/flight simulator featuring filmed footage of the original Star Trek actors. Take your place among the best and brightest at Starfleet Academy!

Galaga meets Tie Fighter meets Elite Dangerous. A sci-fi starfighter combat sim with NASA-accurate Keplerian orbits. Voyage across the Solar System with real-time FTL. Engage Dregg swarms in dynamic PvE encounters. Outmaneuver invaders by pushing Newtonian physics to the limit at 150 m/s.

You are a pilot, seeking revenge on your deceitful father who threw you into unknown space. Can you find your way back and get revenge? Experience a mix of 2D topdown space adventure and explore planets to discover quests, negotiate trades, mine, hunt and survive in an expanding universe.

The spiritual successor to Freelancer with a Lovecraftian, sandbox RPG twist. Explore a vast handmade universe with mod support and PvP/co-op multiplayer. You're going to need a bigger ship.

Endless Sky is a 2D space trading and combat game inspired by the classic Escape Velocity series. Work your way up from a relatively wimpy shuttle, cargo ship, or fighter, to a highly upgraded and customized flagship or to a massive fleet of warships or freighters.

At the sunset of human life on planet Earth, you are a military pilot controlling a space ship, and you find yourself at the very epicenter of the battle in the solar system. You are forced to retreat into the unknown, distant Arcanum system through hyper-jumping.

Rebel Galaxy is a swashbuckling space adventure, with action-packed combat, exploration, discovery, trade, and “negotiation” with the outlandish denizens at the edge of the known universe.

Rogue Stargun is an action-packed space combat sim where you pilot 5 unique starfighters with interactive VR cockpits in a story-driven single player campaign consisting of over 24 unique missions covering both land and space.

Space combat on a massive scale. Defend your allies, destroy the Xeris and claim victory for the Vallen! Your people need you, fly your ship in an intense battle in an asteroid field to secure the sector.

Pilot your starship in Starship Fighters, a realistic space combat simulator. Engage in intense battles, explore vast galaxies, and unleash destruction with an arsenal of powerful weapons in a universe teeming with enemies!

Master a new way to fly and fight. Control every movement and engine burn. Simple controls, realistic flight: a game for space fans by a space fan.

Spaceship building sandbox game. Build various spaceships from scratch and explore the cosmos. Fight different enemies and mine metals and materials to fix or expand your spaceship fleet.

This is a 3D space combat game.You will be driving a transformable mecha to perform missions singly or with your partner.There are large fleet, missile barrage, super beam cannon, dog-fighting and other exciting challenges waiting for you.

Classical 3D space combat simulation with unique 100% dynamic destruction engine, allows you to realistically damage and burn through your enemies exactly where you hit them with blasters, causing their onboard systems and armor to melt away and fall apart. Made by solo developer.