Top-Rated Free Space Sim Games on Steam

Galaxy Idle Clicker - Players say: Pilot a ship through enemy-filled space, gather resources and prisoners, then automate upgrades and reset for lasting bonuses. Players like: Layered Long-Term Progression · Useful Automation · Rewarding Prestige Resets ·

Read More ▶Less ◀

Embark on an interstellar journey with Galaxy Idle Clicker! Conquer galaxies, upgrade your spaceship, and face off against a myriad of enemy ships. With engaging minigames, powerful upgrades, GIC delivers an unparalleled idle space adventure. Join the cosmic conquest today and dominate the universe!

Aug 6, 2025

74% 👍

of 1.2k

Free on Steam More Detail

Astrometica: Prologue - Players say: Stranded in space, gather materials, craft survival gear, follow signals, and build a base to explore asteroid fields. Players like: Exploration With Purpose · Atmospheric Space Setting · Base Building ·

Read More ▶Less ◀

Astrometica: Prologue is the free game about surviving in space. You need to use your skills and tools to stay alive. There are many challenges to face, and you need to fight to survive. You also need to build a new base in space.

May 22, 2024

90% 👍

of 1.3k

Base Building · Space Sim · Survival · Building · Open World · Space · Exploration · Resource Management · Crafting · Automation · Sci-fi · First-Person · Adventure · Inventory Management · Early Access

Free on Steam More Detail

Pixel Starships - Players say: Design a pixel-art starship, assign its crew and AI, then upgrade, explore, and battle other players in a persistent universe. Players like: Ship-Building Depth · Customizable Crew AI · Strategic Combat ·

Read More ▶Less ◀

Pixel Starships is an FTL-style online sci-fi strategy builder and management game with a competitive PVP tournament. Set in the retro galaxy, your role is to explore space, meet aliens, and develop your ship, crew and AI. The game contains deep strategic and 4x elements. PSS is community-driven.

May 23, 2023

73% 👍

of 3.0k

Post-apocalyptic · Sci-fi · Space Sim · Space · Pixel Graphics · Strategy · Automation · Base Building · Massively Multiplayer · 2D · Roguelike · Building · Free to Play · 4X · Multiplayer

Free on Steam More Detail

Prosperous Universe - Players say: Run a spacefaring company by choosing planetary bases, building production chains, moving cargo, and trading in a player-run economy. Players like: Economic Simulation Depth · Supply Chain Planning · Player-Driven Markets ·

Read More ▶Less ◀

In Prosperous Universe start your galactic empire by trading on the real-time market exchange with other real players. Build your 1st base from humble beginnings & watch as your business flourishes with complex supply chain strategies. Economics, politics & realism fuel this immersive business MMO.

Apr 20, 2022

73% 👍

of 1.1k

Early Access · Economy · Resource Management · Sci-fi · Base Building · Sandbox · Open World · Trading · Realistic · MMORPG · Massively Multiplayer · Simulation · Space · Management · Strategy

Free on Steam More Detail

Exo One: Prologue - Players say: Pilot an alien craft across strange worlds, using gravity, momentum and shifting shapes to roll, launch and glide toward a distant beam. Players like: Gravity-Driven Movement · Vast Alien Landscapes · Calm, Dreamlike Atmosphere ·

Read More ▶Less ◀

A strange signal... an alien craft... an interplanetary, gravity-defying journey through space and time. This is the prologue for Exo One.

Aug 21, 2020

94% 👍

of 746

Flight · Sci-fi · Adventure · Relaxing · Atmospheric · Mystery · 3D · Walking Simulator · Third Person · Space · Simulation · Physics · Abstract · Stylized · Soundtrack

Free on Steam More Detail

The Orville - Interactive Fan Experience - Players say: Explore the USS Orville alone or with friends, pilot ships, customize quarters, try onboard diversions, and fight Kaylon craft. Players like: Detailed Ship Recreation · Free-Roam Exploration · Interactive Ship Systems ·

Read More ▶Less ◀

Step aboard the USS Orville (ECV-197), the Planetary Union's finest mid-level exploratory class cruiser. With every room on every deck recreated with painstaking accuracy, you are free to explore the ship at your leisure and engage in all manner of shenanigans!

Jul 23, 2019

90% 👍

of 1.0k

Sandbox · Space · Sci-fi · Multiplayer · Free to Play · Casual · Early Access · Open World · Realistic · Character Customization · First-Person · Online Co-Op · Third Person · Flight · FPS

Free on Steam More Detail

Endless Sky - Players say: Build a life among the stars by trading, mining, fighting, and exploring as you upgrade your ship and assemble a fleet. Players like: Expansive Exploration · Ship and Fleet Building · Flexible Career Choices ·

Read More ▶Less ◀

Endless Sky is a 2D space trading and combat game inspired by the classic Escape Velocity series. Work your way up from a relatively wimpy shuttle, cargo ship, or fighter, to a highly upgraded and customized flagship or to a massive fleet of warships or freighters.

Oct 30, 2015

92% 👍

of 7.1k

Space · Free to Play · Open World · Sci-fi · Singleplayer · Simulation · 2D · Adventure · RPG · Trading · Action · Space Sim · Exploration · Indie · Sandbox

Free on Steam More Detail

Star Conflict - Players say: Pilot customizable combat ships in online PvP and PvE battles, take on missions, and explore open space in a contested alien sector. Players like: Satisfying Space Combat · Varied Ship Designs · Custom Ship Builds ·

Read More ▶Less ◀

Star Conflict is an action-packed, massively multiplayer space simulation game that puts players in the role of elite pilots engaging in a widespread interplanetary skirmish. The whole world for PVP and PVE!

Feb 27, 2013

73% 👍

of 15k

Free to Play · Online Co-Op · Space Sim · Massively Multiplayer · Open World · PvE · Action · Trading · Flight · Shooter · Sandbox · 3D · Crafting · Choose Your Own Adventure · RPG

Free on Steam More Detail

EVE Online - Players say: Pilot a customizable starship across New Eden, exploring, mining, trading, building, and fighting in a player-shaped universe. Players like: Player-Driven Economy · Sandbox Freedom · Consequential Ship Losses ·

Read More ▶Less ◀

Over 20 years of legendary space battles! Explore a massive living universe of danger and opportunity in a challenging and highly rewarding space adventure. Fight, trade, build, and connect with a universe driven and shaped directly by players.