Games like Galaxy Conquest Online
Games like Galaxy Conquest Online include Squad, Arma Reforger, Stick Fight: The Game, Call to Arms - Gates of Hell: Ostfront, and WARNO. We matched them by the tags players give Galaxy Conquest Online on Steam (Real Time Tactics, Military, Space, PvE, and 2D Fighter): closest matches first, and among equally close ones the better-known games.

Squad
Shared: Military · PvP · PvE

Arma Reforger
Shared: Military · Simulation · Real Time Tactics

Stick Fight: The Game
Shared: 2D Fighter · Funny · PvP

Call to Arms - Gates of Hell: Ostfront
Shared: Real Time Tactics · Strategy · Military

WARNO
Shared: Military · Real Time Tactics · Strategy

Stellaris
Shared: Space · Strategy · Sci-fi

Among Us
Shared: Space · 2D · Funny

Men of War: Assault Squad 2
Shared: Strategy · Military · Real Time Tactics

Arma 3
Shared: Military · Simulation · Action

Battlefleet Gothic: Armada 2
Shared: Space · Real Time Tactics · Strategy

Cosmoteer: Starship Architect & Commander
Shared: Space · 2D · Strategy

Wargame: Red Dragon
Shared: Military · Strategy · Real Time Tactics

WARDOGS
Shared: Military · PvP · Action

Total War: THREE KINGDOMS
Shared: Military · Strategy · Real Time Tactics

Nuclear Option
Shared: Military · PvP · Simulation

Company of Heroes 3
Shared: Strategy · Real Time Tactics · PvE

ACE COMBAT™ 7: SKIES UNKNOWN
Shared: Military · Arcade · PvP

FTL: Faster Than Light
Shared: Space · Strategy · Sci-fi

Door Kickers 2: Task Force North
Shared: Real Time Tactics · Military · Strategy

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

GUILTY GEAR -STRIVE-
Shared: 2D Fighter · PvP · Arcade

Battlefleet Gothic: Armada (Classic)
Shared: Space · Real Time Tactics · Strategy

ARC Raiders
Shared: PvE · PvP · Sci-fi

Sea Power : Naval Combat in the Missile Age
Shared: Military · Real Time Tactics · Strategy