Games like Ascent - The Space Game
Games like Ascent - The Space Game include Kerbal Space Program, FTL: Faster Than Light, Stellaris, Elite Dangerous, and Dyson Sphere Program. We matched them by the tags players give Ascent - The Space Game on Steam (Space, Massively Multiplayer, Simulation, Strategy, and Indie): closest matches first, and among equally close ones the better-known games.

Kerbal Space Program
Shared: Space · Simulation · Science

FTL: Faster Than Light
Shared: Space · Strategy · Indie

Stellaris
Shared: Space · Strategy · Sci-fi

Elite Dangerous
Shared: Space · Simulation · Massively Multiplayer

Dyson Sphere Program
Shared: Space · Simulation · Sci-fi

Hardspace: Shipbreaker
Shared: Space · Simulation · Sci-fi

Spacebase DF-9
Shared: Space · Simulation · Strategy

Cosmoteer: Starship Architect & Commander
Shared: Space · Sci-fi · Indie

X4: Foundations
Shared: Space · Simulation · Strategy

Universe Sandbox
Shared: Space · Simulation · Science

SpaceCraft
Shared: Space · Massively Multiplayer · Sci-fi

Tin Can
Shared: Space · Simulation · Indie

Children of a Dead Earth
Shared: Space · Simulation · Strategy

Solar Expanse - Space Exploration Manager
Shared: Space · Simulation · Science

SPORE™
Shared: Simulation · Space · Science

Kerbal Space Program 2
Shared: Space · Simulation · Science

Between the Stars
Shared: Space · Simulation · Indie

Infinity: Battlescape
Shared: Space · Simulation · Massively Multiplayer

Space Pirates And Zombies 2
Shared: Space · Strategy · Indie

Starbase
Shared: Massively Multiplayer · Simulation · Space

STAR WARS™ Empire at War - Gold Pack
Shared: Space · Strategy · Sci-fi

BidKing
Shared: Strategy · Simulation · Massively Multiplayer

Celestial Command
Shared: Space · Simulation · Strategy

Particle Fleet: Emergence
Shared: Space · Strategy · Simulation