Games like Artemis Cosmos
Games like Artemis Cosmos include Elite Dangerous, Trailmakers, Warhammer 40,000: Space Marine 2, X4: Foundations, and No Man's Sky. We matched them by the tags players give Artemis Cosmos on Steam (Action, Space, Sci-fi, Team-Based, and Simulation): closest matches first, and among equally close ones the better-known games.

Elite Dangerous
Shared: Space · Sci-fi · Space Sim

Trailmakers
Shared: Space · Action · Family Friendly

Warhammer 40,000: Space Marine 2
Shared: Action · Sci-fi · Action-Adventure

X4: Foundations
Shared: Space · Simulation · Sci-fi

No Man's Sky
Shared: Space · Sci-fi · Exploration

X Rebirth
Shared: Space · Action · Sci-fi

Starfield
Shared: Space · Sci-fi · Exploration

Deliver Us The Moon
Shared: Action · Space · Sci-fi

Kerbal Space Program
Shared: Space · Simulation · Space Sim

STAR WARS Jedi: Fallen Order™
Shared: Action-Adventure · Sci-fi · Action

Endless Sky
Shared: Space · Sci-fi · Simulation

Avorion
Shared: Space · Space Sim · Exploration

STAR WARS Jedi: Survivor™
Shared: Action · Sci-fi · Space

EVE Online
Shared: Space · Space Sim · Exploration

Universe Sandbox
Shared: Space · Simulation · Space Sim

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

Prey
Shared: Sci-fi · Space · Immersive Sim

Stellaris
Shared: Space · Sci-fi · Simulation

V: Rings of Saturn
Shared: Space · Sci-fi · Exploration

SPORE™ Galactic Adventures
Shared: Action · Space · Simulation

Starcom: Unknown Space
Shared: Space · Sci-fi · Exploration

The Callisto Protocol™
Shared: Sci-fi · Space · Action

EVERSPACE™
Shared: Space · Action · Sci-fi

Rebel Galaxy
Shared: Space · Sci-fi · Action