Games like Kerbal Space Program on Steam
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Bridge Constructor: The Walking Dead
Bridge Constructor: The Walking Dead combines the legendary and challenging puzzle gameplay of Bridge Constructor™ with the post-apocalyptic zombie universe of AMC’s The Walking Dead.
Bridge Constructor Portal
Enter the Aperture Science Enrichment Center and experience Bridge Constructor Portal – the unique merging of the classic Portal™ and Bridge Constructor™ games.
STAR WARS™ - X-Wing Special Edition
Against the overwhelming might of the Empire stands a small but growing Rebel Alliance. Scattered resistance groups are uniting and what is needed most now are Starfighter pilots. Will you join their struggle to end this tyranny and become a hero of the Rebellion?
Ascent - The Space Game
Ascent is a PVE sandbox space MMO with 270 BILLION star systems and an emphasis on strong Sci Fi. It encourages Exploration, Colonization, Research, Asteroid mining, Farming, Trading, and Combat. Outside the tutorial sector, everything in-game has been built by players.
Last Wood
In Last Wood, it is an oceanic world after the Fall. You will guide several survivors in the ocean from pieces of rafts, survive, build rafts, defense the threats, explore the unknown world, even have their offsprings, and find the truth of the world.
Megaquarium
The public aquarium simulator. Design your displays, look after your fish, manage your staff and keep your guests happy! It's all in a day's work as the curator of your very own Megaquarium.
Galactic Civilizations IV
Take command of a civilization that has just achieved faster-than-light travel in Galactic Civilizations IV, the newest entry in the award-winning space 4X strategy game series. Explore the galaxy, colonize worlds, shape cultures, make alliances, fight wars and pioneer new technologies.
Logic World
Build. Program. Simulate. Logic World teaches you how circuits do math.
The Enjenir: The Engineering Physics Building Simulator
Put your engineering and problem solving skills to the test in this sandbox physics building game! Enjoy the freedom of completely gridless 3D sandbox building combined with hilarious ragdoll third person controls, offering a truly unique and hilarious "Enjeniring" experience!
Builder Simulator
Builder Simulator is the perfect game for those who want to build a house, from the ground up, one brick at a time. On easy, the game will guide and teach you by showing you full instruction, but on hard you will get no help - instead rely on your builder skills and make everything yourself.
Ultimate Ragdoll Game
Ultimate Ragdoll Game is a Sandbox game without any limits. Have fun with ragdolls available in Steam Workshop and build your very own constructions using wide variety of blocks.
Tiny Town VR
Create an original world and fill it with buildings, roads, vehicles and more. Give it life with posable characters. Tell a story with custom speech bubbles and in-game photo captures. Then, share with friends!
Learn to Fly 3
Build your spaceship from scratch, earn funds and invest them into building a bigger, better spaceship as you try and fly your way up to space!
Signal Simulator
Game inspired by SETI. Take the role of a scientist to find an extraterrestrial signal .Control massive Radio Antennas by using interactive control in your Observatory. Detect , download and decode unknown or story telling signals. Manage and Maintain an electrical system to improve your systems and make it more efficient.
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!
Project Highrise
Project Highrise is a skyscraper construction and management sim...
Hot Dogs, Horseshoes & Hand Grenades
Do you like hot dogs? How about horseshoes? Hand grenades? (everyone likes hand grenades) Anyway, we've got all that, and guns. SO MANY GUNS. So if you like ordnance, meat, and far too many groan-worthy puns, this is the VR sandbox game for you.
Rebel Galaxy
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.
Center Station Simulator
Mine, farm, manufacture components and build a wide range of machines in an infinite basement. Forget primitive tasks thanks to automation! And sell your products to your customers! Build a parking, a gas station...
Total Tank Simulator
Commander in the ranks. Soldier at heart. Choose a faction and deploy and command your army into massive physics-driven WWII battles to the last man standing. Destroy everything on sight with an insane amount of units that will behave tactically.
Dyson Sphere Program
Build the most efficient intergalactic factory in space simulation strategy game Dyson Sphere Program! Harness the power of stars, collect resources, plan and design production lines and develop your interstellar factory from a small space workshop to a galaxy-wide industrial empire.
Occupy White Walls
A game about building art galleries may sound boring until you realise that just about anything can be an art gallery... Add in cutting edge AI, extremely creative community, Unreal graphics, and did we mention it's free?