Games like Sirius

"Drifter" is a single-player Sci-Fi Simulation game with exceptional gameplay, set in a procedurally-generated galaxy of 100,000 light years. As a spaceship captain, engage in trading goods, pirate hunting, mining, or piracy, with an original soundtrack by Danny Baranowsky. It takes around 6 hours to complete game's main storyline.

Project Genom is an Alpha stage open-world sci-fi MMORPG set on a renewed world with new characters, enemies, NPCs, and artificial intelligence. The game features a hundred square kilometers of explorable terrain, 10 instances, customization options, and initial character skills upgrades, with frequent updates planned leading to its full release. Please note that the game is still in its Alpha stage, so many mechanics are yet to be introduced.

"Entropy is a massively multiplayer Science Fiction RPG set in a vast, open universe with 100+ solar systems. Engage in freeform gameplay, including hunting, trading, mining, and combat. Players contribute to shaping the ever-evolving universe."

In case you're curious about the game "Gods and Idols" , here's a brief summary: As an ascended being, once human but now a divinity, you must guide your followers, build and protect temples, and sculpt planets into hospitable worlds. However, mere benevolence won't be enough - you'll need to defend your empire from various enemies. Prepare to wield power through worship, craft lush wonderlands, and safeguard your believers in this strategic, immersive universe.

"Kinetic Void" is a sandbox-style space simulation game that allows players to build and customize their own spaceships while exploring the universe. The game features a dynamic economy, interactive ship components, and multiple factions to interact with. Players can engage in combat, trade, or diplomacy as they navigate the open world of "Kinetic Void".

Astrox Imperium is a single-player space strategy game that lets you explore, gather resources, build space stations, and manage interstellar politics. Engage in real-time combat with AI-controlled ships while navigating a vast, procedurally generated universe. Experience an immersive narrative with multiple branching storylines based on player choices.

"Starbase" is a science fiction open-world game in early access that combines single-player, co-op, and massively multiplayer options with a focus on building, designing, and battling in space. Its destructible environment and hybrid voxel/vertex mechanics allow for detailed simulations and creativity, but expect some bugs and grinding. The game includes impressive graphics, exceptional music, and a full roadmap of upcoming features.

SpaceBourne 2 is an upcoming open-world space combat simulation game that allows players to explore, trade, and fight across procedurally generated galaxies. Players can build and customize their spaceships, recruit crew members, and engage in various missions and activities. The game promises improved graphics, more complex mechanics, and a richer narrative compared to its predecessor.

"HELLION is a Science Fiction Simulation game that offers both single-player and multiplayer modes, including co-op and PvP. The game boasts a good plot, spectacular gameplay, and wonderful visuals, but is hindered by numerous bugs, optimization issues, and grinding. Despite a bumpy start, HELLION delivers a unique and complex multiplayer space survival experience."

"Osiris: New Dawn" is a sci-fi survival game where players explore and colonize alien planets. Gather resources, build bases, and advanced technology to survive against the harsh environment and alien creatures. Fight solo or with friends in online multiplayer mode to expand your territory and uncover the mysteries of the galaxy.