Games like Cosmic Order Fleet
Games like Cosmic Order Fleet include Dota 2, Company of Heroes 3, Broken Arrow, WARNO, and Wargame: Red Dragon. We matched them by the tags players give Cosmic Order Fleet on Steam (Wargame, Real Time Tactics, MOBA, PvE, and RTS): closest matches first, and among equally close ones the better-known games.

Dota 2
Shared: MOBA · eSports · Strategy

Company of Heroes 3
Shared: Wargame · Strategy · RTS

Broken Arrow
Shared: Wargame · Real Time Tactics · Strategy

WARNO
Shared: Wargame · Real Time Tactics · RTS

Wargame: Red Dragon
Shared: Wargame · RTS · Strategy

Mechabellum
Shared: Wargame · PvP · Strategy

Total War: WARHAMMER II
Shared: Strategy · RTS · Real Time Tactics

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

Squad
Shared: PvP · PvE · Wargame

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

Total War: WARHAMMER III
Shared: Real Time Tactics · Strategy · RTS

Wargame: Airland Battle
Shared: Wargame · Real Time Tactics · RTS

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

Planetary Annihilation: TITANS
Shared: Real Time Tactics · RTS · Strategy

Demigod
Shared: Real Time Tactics · MOBA · PvP

Bad North: Jotunn Edition
Shared: Wargame · Real Time Tactics · RTS

Ultimate General: Civil War
Shared: Wargame · Real Time Tactics · RTS

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

Tom Clancy's Rainbow Six Siege
Shared: PvP · eSports · Tactical

Ukrainian Warfare: Gostomel Heroes
Shared: Wargame · Real Time Tactics · PvE

Creeper World 4
Shared: Real Time Tactics · Wargame · RTS

Kingdom Heroes 8
Shared: Real Time Tactics · RTS · Wargame

Total War: ROME II - Emperor Edition
Shared: Strategy · Real Time Tactics · RTS

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