Games like Ostranauts on Steam
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Wayward Terran Frontier: Zero Falls
2d space combat like no other. From the perspective of a single crew member, explore the fully destructible interior of any ship in a massive living world. Engage in space combat with no hitpoints where you know your enemy is dead when you see them fall out of their ship into the cold dark of space.
Occupy Mars: The Game
Survive and colonize Mars in a highly technical, open-world sandbox game. Build and upgrade your base, discover new regions, conduct mining operations, retrieve water, generate oxygen, grow crops, and fix broken parts.
Soulash 2
Soulash 2 is a sandbox RPG roguelike with a procedurally generated open world, simulated history, skill-based progression system, customizable abilities, material-based crafting, building, trading, and the possibility of total mayhem. Will you save your world or destroy it?
Junkyard Simulator
Did you ever wish to work in a junkyard? Now you can, with Junkyard Simulator. They are many roads leading to success - whichever you take depends on your decisions.
Saleblazers
Fight. Sell. Survive. Live off the land, build your perfect shop, and defend against nightly horrors in this open world survival shop simulator for 1-8 players.
House of Legacy
Step into the shoes of a fallen clan leader, starting with nothing but a crumbling estate and a handful of hopes, rising through careful planning, trade, and diplomacy to become one of the most powerful families in the land. Now it’s time to forge a legendary dynasty that leaves its mark on history.
VoidExpanse
Explore the vast reaches of VoidExpanse -- mine asteroids, upgrade your ship, trade, complete missions, advance your character and survive fast-paced combat with hostile aliens and mercenaries in the rich and exciting Sci-Fi universe of VoidExpanse!
Reentry - A Space Flight Simulator
Do you have what it takes to be an astronaut? Reentry is a realistic space flight simulator based on NASAs space programs; from the first American human spaceflight in Project Mercury, the rendezvous and EVAs of Project Gemini to the Moon landing in Project Apollo.
Xsyon - Prelude
Xsyon is a player driven apocalyptic fantasy sandbox MMORPG, set in a living and evolving environment. Players create the world they want to live in as they form tribes, construct towns, shape landscapes, create quests, hunt, farm, gather, build societies and develop a New World.
ZED ZONE
A great catastrophe has come, and you, who are on duty, crash and trapped in a Zed Zone. There are zombies and monsters everywhere, In order to escape, by collecting materials, upgrading skills, building shelters, defeating zombie waves and mysterious mechs, chasing a glimmer of hope.
The Last Plague: Blight
The Last Plague: Blight is an authentic survival experience rooted in realism and immersion. Endure the hazards of a brutal open world and uncover the origins of a mysterious disease. You are humanity’s final hope in ending the Blight
EmergeNYC
EmergeNYC is a simulation of New York City's Emergency Services. Drive over 30 different Emergency Vehicles with up to 32 of your friends through busy City Streets with blazing sirens and air horns. Take the role of a firefighter, medic, or police officer and ride with your friends to emergencies
Sailwind
Sailing simulator featuring realistic sailing physics and a vast open world to explore. Embark on cargo delivery missions, customize your boat, try fishing and cooking. A relaxing day sail, or an epic ocean voyage? Your sailing adventure starts here!
Spirit Realm
English version not ready
Card Survival: Fantasy Forest
Card Survival: Fantasy Forest is a card-based deep survival simulator and the next installment in the Card Survival Series. Carve yourself a home in a primordial forest that has a will of its own. A day-to-day life simulator in a world where nature reigns with mystery, beauty and sometimes cruelty.
Railroader
You and your fellow railroaders are the lifeblood of your railroad, just like it is the lifeblood of the communities it serves. Switch cars at industries. Keep people moving while running local passenger trains. Run trains with a purpose in transition era Appalachia – in Railroader!
Cine Tracer
Cine Tracer is a realistic cinematography simulator. The player operates real world based cameras, sets up lights, and directs talent/actors in stunning next gen environments created in Unreal Engine 4.
Haven & Hearth
A free-to-play MMORPG with crafting, building, landscaping, foraging, hunting, fishing, a dash of poetry, and open PvP combat,
Starpoint Gemini 2
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.
Astrox Imperium
Astrox Imperium is a relaxing space game where you fly around a generated universe. Mining, Fighting, Building, Exploring, and Surviving. What makes this game unique? You have complete control of how it plays. A robust sandbox and lots of MOD tools. Make it your game, and play it your own way.
SpaceEngine
The world's first science-based photorealistic interactive 3D planetarium that models the entire Universe, using procedural generation for uncharted areas.
Total Miner
Total Miner is an open world voxel sandbox game. It is primarily designed for creative RPG game builders, but also has two action/adventure style game modes where you can just jump in and play.