Games like Extermination Shock
Games like Extermination Shock include Elite Dangerous, ACE COMBAT™ 7: SKIES UNKNOWN, EVE Online, HELLDIVERS™ 2, and Avorion. We matched them by the tags players give Extermination Shock on Steam (Action, Space Sim, Simulation, Arcade, and Shooter): closest matches first, and among equally close ones the better-known games.

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

ACE COMBAT™ 7: SKIES UNKNOWN
Shared: Arcade · Shooter · Action

EVE Online
Shared: Space Sim · Simulation · Exploration

HELLDIVERS™ 2
Shared: Action · Shooter · Sci-fi

Avorion
Shared: Space Sim · Exploration · Action

War Thunder
Shared: Action · Simulation · Combat

EVERSPACE™
Shared: Action · Space Sim · Roguelite

X4: Foundations
Shared: Simulation · Space Sim · Space

Arma 3
Shared: Action · Simulation · Shooter

X Rebirth
Shared: Simulation · Action · Space Sim

STAR WARS™ Battlefront™ II
Shared: Shooter · Action · Sci-fi

Galaxy on Fire 2™ Full HD
Shared: Space Sim · Shooter · Arcade

Kerbal Space Program
Shared: Simulation · Space Sim · Space

Void Crew
Shared: Space Sim · Roguelite · Action

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

STAR WARS™ Battlefront II (Classic, 2005)
Shared: Action · Shooter · Sci-fi

FPV Kamikaze Drone
Shared: Action · Simulation · Shooter

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

Arma Reforger
Shared: Simulation · Action · Shooter

MechWarrior 5: Clans
Shared: Action · Simulation · Shooter

Project Wingman
Shared: Action · Arcade · Simulation

Jump Space
Shared: Action · Roguelite · Sci-fi

Starship Troopers: Extermination
Shared: Action · Sci-fi · Arcade

House of the Dying Sun
Shared: Action · Simulation · Space Sim