Games like Ostranauts

"Starmancer is a single-player Science Fiction Role Playing game with phenomenal gameplay and delightful graphics, but be prepared for lots of grinding and bugs. As a Starmancer AI, construct and manage a space station for human refugees, encountering monsters, alien probing, and forbidden technologies in this vast wilderness of space."

# Let's Occupy Mars! Occupy Mars is a highly technical, open-world sandbox game about Mars colonization inspired by the most promising technologies and companies that are working toward becoming a multi-planet species. Build and upgrade your base, discover new amazing regions, conduct mining operations, retrieve water, generate oxygen, grow crops, fix broken parts, and learn how to survive on Mar…

"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."

Space Haven is a space colony simulation game where you lead a group of survivors in building a home among the stars. Manage resources, research new technologies, and navigate the dangers of space while dealing with the needs and personalities of your crew. Your decisions will determine the success or failure of your space voyage. Create and manage your own unique space habitat as you see fit.

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.

X4: Foundations is a sandbox space simulator that allows players to explore, trade, fight, and build in a vast universe. Take control of your own space empire, where every decision from ship hiring to trade routes has a direct impact on your income and influence. With a dynamic narrative and a variety of factions to interact with, X4: Foundations offers a rich and immersive space experience.

VEIN is a post-apocalyptic survival multiplayer sandbox where you navigate a world overrun by hostile zombies and hostile bandits. Gather resources, explore abandoned areas, defend your base, and rebuild society alongside friends in a dynamic environment with realistic AI that senses your presence. Changing seasons and random events continually challenge your survival.

inZOI is a life simulation game where players shape vibrant cities and guide autonomous characters called Zois, who live with free will and create dynamic stories. With realistic graphics and immersive environments, players influence weather, properties, and events to witness evolving relationships, trends, and challenges. Experience the beauty and complexity of life through this richly detailed community simulation.

Lost Skies is an open-world adventure set among floating islands where you explore ancient ruins and harness the mysterious power Atlas. Battle ancient turrets, drones, and colossal sky creatures while crafting and upgrading your skyship, which serves as both your home and weapon. Uncover the secrets behind a lost civilization’s downfall through exploration and intense sky battles.

Mist Survival is a first-person open-world survival game set in a post-apocalyptic world overrun by zombies. Develop strategies to survive by scavenging for resources, crafting tools, and setting up defenses against the undead. Build and manage your own base, form alliances with other players, and navigate through a dynamic and ever-changing environment.