Top similar games like Spiritus Astrum:

Navigate your scrappy ship through the boneyard in search of valuable parts in abandoned vessels. Use salvage to upgrade your ship, or sell it for cash to pay down your mounting debt, or restock fuel, air, or food. Fly and role-play aboard your dream spaceship in this hardcore noir space-sim.

A retro-future sandbox RPG set in a frontier era galaxy with procedurally-generated elements. Create, explore, trade, and battle to stake your claim among the stars of a wild galaxy!

Build, host, and survive in a persistent multiplayer space sandbox set in the outer Sol system. Construct orbital habitats, manage fragile station systems, and keep your crew alive while expanding through zero-g, Saturn-ring danger, and player-built infrastructure.

The conquest of the Solar System has begun – prove yourself as a space colonist! Pilot the spaceship, choose the planet you wish to inhabit and build your new home. However, remember that there are no rules or laws in outer space. Don't underestimate the danger and stay vigilant – enemies are near!

Make a living for yourself in a city full of opportunity while you meet a variety of locals, explore unique locations, and work your way to the top in this open-world life simulator.

No Man's Sky is a game about exploration and survival in an infinite procedurally generated universe.

Medusa Frontier is a budget sci-fi survival game being developed with OpenGL & C++. Gameplay is currently limited to resource gathering and base building on a 1k terrain map.

Main Sequence is a space-sim factory builder where your goal is to build an interstellar industrial empire. Collect resources, automate production, and expand your fleet of ships in order to survive and leave your mark on the galaxy.

After a century in cryosleep you find yourself stranded amidst the ruins of mankind’s first interstellar colony. Explore derelict ships and stations and harvest raw resources in search of air, fuel and other equipment. Or loot and pillage what you need from other survivors. The choice is yours!

Explore a seamless endless universe with an uncountable number of galaxies, stars, planets, and moons. Make friends or enemies with unique alien civilizations. Research upgrades for your vessel with scientific phenomena and alien tech that you've acquired.

In this multiplayer game you have to explore the Solar System in real scale. Control spaceships of the near future, explore planets, moons and asteroids, mine resources, fight for space domination and build the future of the universe.

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!

Welcome to our sci-fi space adventure, where players take on the roles of a crew aboard a spaceship as they work together to survive in the vast and dangerous universe.

Inspired by Space Station 13! Live a robust life on a Space Station, grow plants, mutate them into new types of plants, mix different chemical reagents, and when you are ready, get out and explore outer space to acquire wealth by mining minerals on asteroids.

Mushroom Collector Simulator is a mushroom picking simulator that involves you in the hunt for many different mushrooms that grow in the wild. Collect mushrooms, enjoy walks through the forest, complete missions, upgrade your hut and equipment.

A hard sci-fi survival sim where each decision costs power. Every system drains your dying reactor. Pilot a crippled spacecraft across a real-scale solar system using true orbital mechanics, manage critical systems, and fight to reach Earth — where space itself is the only enemy you need.

Sigma World Online - is an online sandbox with a huge world from many star systems. Choose who to be: space explorer, miner, merchant, farmer, culinary specialist, scientist, builder or hunter, or build your empire.

Explore a vast universe, uncover the mystery of humanity's demise, gather resources, build bases, and scan the unknown. Your journey awaits in this post-apocalyptic sci-fi adventure.

Survive and build your base on floating islands in a world transformed by chaos magic. Explore, gather resources, and construct your own flying ship to travel between islands.

Funorbit is a space survival simulation with realistic physics, resource gathering, crafting, and building. Navigate a vast universe using orbital mechanics, encounter drifting meteoroids, and construct space stations to survive.

Space Travellers is a unique open-world sandbox space simulator set in the year 2343. Travel the galaxy, trade, explore unexplored worlds, fight, build bases and factories, forge alliances and experience new adventures!

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!

Survive the void in Null Hørizøn. Trade, fight, and explore a retro-futuristic 3D galaxy with 2D sprites. Upgrade your ship, smuggle goods, and travel across the universe. Tactical Real-Time combat meets Grid-based exploration in this atmospheric space sim. The Null Hørizøn calls, Captain.

Factory management and sandbox base building in zero-g environment. Survive, expand and then dominate space industrial market. Build large scale resource processing plant completely from nothing.

Space one has been postponed at this time.

A light-hearted but deep first person exploration and survival game for you and your friends set in a procedurally-generated asteroid belt on the edge of known space. Explore the world, learn new skills, build and defend your base, and conquer the belt's unique threats.

☵ HIRAETH is a sci-fi, first-person realistic survival game set on the desolate alien planet Ahra Prime, now offering an introduction to Story Mode with tasks and a multi‑stage quest. Explore on foot, by vehicle, or underwater as the planet tests you. Only the strong survive – but how long… and you?

Survirail is a survival game from a first-person perspective. Travel through space by train, explore space stations, collect resources, fight enemy androids and develop your mobile base to survive and discover the truth.

Outerra World Sandbox gives you the whole world to use as canvas to create, explore and share. Create terrain and share it online or download the creations of others and then explore it on foot or in any mode of transportation that you and the community create.

Shuttle World is a first person open world sandbox game, integrating exploration, construction, survival, entertainment and other elements. Players can embark on adventures alone in the game, exploring the entire vast planet! Various free gameplay, welcome to download...

Finnish Cottage Simulator is the ultimate cottage experience. Relax and enjoy the Finnish summer nature, go to the sauna, get drunk, grill food or play games with others!

Crash-land onto a unique and hostile alien world and begin your fight to survive. Face its inhabitants, upgrade your technology, create outposts & bases, and find a way to repair your ship. Explore the beautifully strange terrain, all while blasting and crafting your way off of the planet.

Above Earth is a science fiction survival game. Experience a struggle for life in the fragile artificial environment of a damaged space station.

WarpedSpace is a sci-fi survival adventure game set in deep space. A massive, open environment full of wonder and peril awaits you!