Games like Galactic Simulator 3
Games like Galactic Simulator 3 include Kerbal Space Program, Universe Sandbox, X4: Foundations, Stellaris, and SpaceEngine. We matched them by the tags players give Galactic Simulator 3 on Steam (Simulation, Idler, Space Sim, Space, and Strategy): closest matches first, and among equally close ones the better-known games.
Kerbal Space Program
Shared: Simulation · Space · Space Sim
Universe Sandbox
Shared: Simulation · Space Sim · Space
X4: Foundations
Shared: Simulation · Space · Space Sim
Stellaris
Shared: Space · Strategy · Simulation
SpaceEngine
Shared: Space · Space Sim · Sandbox
Elite Dangerous
Shared: Space Sim · Space · Simulation
Hardspace: Shipbreaker
Shared: Simulation · Space · Space Sim
Totally Accurate Battle Simulator
Shared: Simulation · Sandbox · Strategy
FTL: Faster Than Light
Shared: Space · Strategy · Indie
SPORE™
Shared: Simulation · Sandbox · Space
No Man's Sky
Shared: Space · Procedural Generation · Sandbox
Nodebuster
Shared: Idler · Simulation · Strategy
Kerbal Space Program 2
Shared: Space · Sandbox · Simulation
Spaceflight Simulator
Shared: Space Sim · Simulation · Space
Mountain
Shared: Simulation · Casual · Indie
Vanguard Galaxy
Shared: Idler · Space · Sandbox
Space Engineers
Shared: Simulation · Space · Sandbox
Empyrion - Galactic Survival
Shared: Simulation · Space · Space Sim
A Game About Feeding A Black Hole
Shared: Idler · Strategy · Simulation
Cookie Clicker
Shared: Idler · Casual · Incremental
X Rebirth
Shared: Simulation · Space · Space Sim
Plague Inc: Evolved
Shared: Simulation · Strategy · Indie
Dyson Sphere Program
Shared: Space · Simulation · Sandbox
Planet Coaster
Shared: Simulation · Sandbox · Strategy