Top similar games like Once Upon The Universe:

The ultimate space capital ship combat compendium is the evolution of hard core space combat sims. The only game of its kind currently in existence.

Create and destroy on a scale you’ve never imagined!

Cast the Spark of Life into an empty ocean and watch deep time do the rest. Microbes become fish, fish crawl ashore, and one day something wakes up and builds a civilization. Nudge the world with god powers, then see if anyone makes it to the stars.

Build stellar rollercoasters across alien worlds, carve tunnels through planets, and launch trains into orbit. Customize every track element, scenery decoration, and environment before subjecting riders to the forces of the universe! The galaxy is your theme park!

The Stars Are Never Still is a 2D space sandbox. Shape a galaxy and watch 16 unique races colonize, trade, ally, betray and wage war. Observe, or intervene with technology, aid, discord, disasters, new life—even black holes. Chronicle millennia of history. No set goals. No empire lasts forever.

Manage a space station, flying through a procedually generated universe, fight, build and survive in the coldness of space.

In the distant future, the X universe faces a period of profound and irrevocable change. While the universe stumbles towards an uncertain future, countless adventures await as new enemies rise in search of power.

Pebble to Star is an idle growth game. Swallow the bodies that drift past and raise a grey pebble into a planet, a star, even a black hole and a galaxy, immersed in an ever-changing universe.

Draw on a planet and watch physics answer. A climate, ocean and erosion simulator you can edit with a brush — dry the Mediterranean, green the Sahara, stall the Atlantic conveyor. 38 scenarios across the Solar System, Cretaceous Earth and five real exoplanet systems.

Become the Captain of an interstellar cruiser and journey across the galaxy to save the Republic. During your journey you will have to make important decisions, improve the weaponry of your ship and fight against numerous enemies.

Crash-land on an alien planet where every 10 cm cell is simulated: heat, gases, fluids, fire, radiation. Survive, automate mines and factories, split the atom, build a rocket and return to the stars. 2D pixel-art factory survival, solo or online co-op.

From a small 2-man team comes a unique space station management sim. Take on the role of an A.I commanding a lost space ark. Try not to let your crew run amok and wreck the place.

Engage in the construction of your station from a variety of different modules. Create your space fleet. Protect your base from enemies...

It is the year 2938. The long wished-for encounter of the X Universe and the Earth holds both joy and sorrow for the people. Despite flourishing trade, the clash of the diverse races, cultures and life forms creates new tensions, mistrust and open conflict that need to be overcome!

Take the position of a CEO of a space transport company and become a new major player in the industry. Space Company Simulator is a realistic management sim game that will challenge your planning skills as you strive to launch the first manned mission to Mars.

Space Station Continuum is a building & management sim inspired by the past, present, and future of humans in space.

Stardeus is a deep colony sim set on a broken starship manned by drones and hibernating human survivors. As the AI, have your drones repair your ship, save your crew and travel the stars in this beautiful simulation.

Ancient Space is a story driven single player real time strategy game where you take command of a fleet embarking on a scientific mission to chart undiscovered reaches of space called ‘The Black Zone’. Overcome overwhelming odds and fight for your life and the survival of your ship and its crew.

Dynamic abstract sandbox universe. Changes and evolves as you do.

Elysian Eclipse is a Sandbox Evolution Simulator, letting you evolve from an amoeba into a space traveling sentient being. Create your own creatures, buildings and vehicles to conquer procedural planets. Turn the galaxy into your personal playground!

Build amongst the stars in Starport Delta, a light sci-fi strategy game that focuses on survival. Station Commanders across the universe will turn to you for guidance to expand, defend, and survive. Help them build a thriving station, but watch out, there are many dangers hiding in space...

Start as an asteroid, grow by absorbing other celestial bodies to become a planet, a star, and ultimately a black hole. Experience realistic gravity and orbital physics in an ever-evolving sandbox universe.

The Fermi Paradox is a choice-driven sci-fi narrative strategy game in which your decisions in one corner of the galaxy can upend entire civilizations in another. Guide species through millennia and help them explore the vastness of space, make contact and, perhaps, create harmony.

Create & destroy on an unimaginable scale with a realistic physics-based space simulator. Explore the beauty of our universe and the fragility of our planet. Use science to bend the laws of gravity, collide planets, boil away oceans, fire epic space lasers, and customize your universe.

Explore the Solar System. Mine and drop asteroids. Colonize and terraform. Lead the space race and compete with other corporations on your way to profit. Watch the expansion of human race over the centuries.

In Reus, you control powerful giants to shape the planet to your will. You can create mountains, oceans, forests and more. Enrich your planet with plants, minerals and animal life. There is only one thing on the planet that you do not control: mankind, with all their virtues and and all their vices.

Galactic Simulator 2: Stargate is a roguelite simulation game inspired by the Fermi Paradox and the Great Filter. Pilot your ship, gather resources, build stargates, and discover other civilizations as you explore an ever-evolving 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.

Equipped with cutting-edge salvaging tech, carve & slice spaceships to recover valuable materials. Upgrade your gear to take on more lucrative contracts and pay your billion credits debt to LYNX Corp!

Welcome to the Training Day on Mars! In this free version of our advanced simulator you will learn everything you need to know about repairing and maintaining Mars Rovers.

Build a galactic transportation empire and supply humanity with everything it needs to colonize the stars. In this sci-fi logistics simulator, grow your company from a local transport agency into an interstellar logistics behemoth! Singleplayer, vs AI, and online multiplayer.

A single-developer passion project. A seamless full scale solar system. Thrilling action. Be part of an incredible journey as a Universe is built from the ground up!

Build a 3D multi-layer starship and lead your colonists. Mine resources and salvage wreckage in space, or land to gather supplies on planets. Fight enemies, protect your crew, and build robots for the ultimate mobile base.

Gaia Maker is a planet-wide simulation game of terraforming, based on real physics and geology. As the planet's overseer, wield advanced technologies to reshape barren planets into life-filled worlds. Foster animal life, cultivate civilizations, or destroy them. Their fate is in your hands.

The ultimate space sandbox. Participate in epic fleet battles, form alliances, strive to dominate entire galaxies and harness the universe’s resources for your industrious empire or the destruction of others. Customise your experience, the universe is yours!

Become a pioneer of spaceflight. As an engineer in the Soviet Space Program you will be responsible for repairing, fixing and building the iconic spacecraft and rockets from the R-7 family.