Games like Ostranauts on Steam
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Black Ice
Hack greedy megacorps to help as many people as you can in a high-agility cyberpunk looter/shooter RPG. Explore neon cyberspace vistas and outmaneuver AIs to customize your hacker OS and weapon combos. Think Borderlands meets Tron. Play solo or online co-op with up to 10 people!
Salt 2: Shores of Gold
Salt 2 is an open world pirate game focused on exploration, survival, and RPG elements. Play solo or with up to 5 friends as you sail the sea with your ship as a mobile base. Discover islands full of quests, towns, caves, and secrets. Level up, craft epic gear, hunt, fish, and decorate your ship.
Wurm Unlimited
Wurm Unlimited is the standalone version of the fantasy sandbox world Wurm Online, the MMORPG where the players are in charge! A pioneer in the ideas of player influence, crafting and adventure, it is now one of the most deep and feature packed true sandbox experiences available.
KINGDOMS
KINGDOMS is a procedural medieval RPG in a randomly generated open world. The main feature of KINGDOMS is a smart AI system that completely controls NPC behavior. As the player, you can fully interact with this massive world and become any person you want to be.
TFM: The First Men
An open-world colony sim based on stories of the first men. Infinite possibilities await your very own Adam and Eve as they embark on a generation-spanning adventure. How will you shape their future?
NIMBY Rails
Design and run your own railroads for the real world. Solve global transportation dilemmas. Unleash your inner railway engineer and transit policy manager.
Cornucopia®
Stardew Valley meets Paper Mario. Farm, build, and romance in a magical 2.5D world. Befriend over 50 characters, fall in love with 34+, raise adorable animals, and grow crops using real soil science. No forced bedtime. Cozy, charming, and full of secrets. Build your dream life in Cornucopia®.
Space Engineers
Space Engineers is a sandbox game about engineering, construction, exploration and survival in space and on planets. Players build space ships, space stations, planetary outposts of various sizes and uses, pilot ships and travel through space to explore planets and gather resources to survive.
Cyberpunk 2077
Cyberpunk 2077 is an open-world, action-adventure RPG set in the dark future of Night City — a dangerous megalopolis obsessed with power, glamor, and ceaseless body modification.
Breachway
Explore the galaxy in this deckbuilding, sci-fi roguelike where ship upgrades and crew management are key to your survival. Optimize resource generation, engage in intense turn-based battles, and take on ever-growing threats as you seek out The Signal.
Soulmask
Escaping a deadly sacrificial ritual, you find an ancient mystical mask on your journey. This mask holds potent knowledge, changing the world you knew. Face the harsh challenges of nature, survive, rally followers, and build your own tribe. Explore and unveil the truths behind the enigmatic mask.