Games like Space Mantlet
Games like Space Mantlet include Broken Arrow, Wargame: Red Dragon, WARNO, Terminator: Dark Fate - Defiance, and Starship Troopers: Terran Command. We matched them by the tags players give Space Mantlet on Steam (Strategy, RTS, Real Time Tactics, Wargame, and 3D): closest matches first, and among equally close ones the better-known games.

Broken Arrow
Shared: Strategy · RTS · Wargame

Wargame: Red Dragon
Shared: Strategy · RTS · Wargame

WARNO
Shared: Wargame · Real Time Tactics · RTS

Terminator: Dark Fate - Defiance
Shared: Strategy · RTS · Real Time Tactics

Starship Troopers: Terran Command
Shared: Strategy · RTS · Military

Aliens: Dark Descent
Shared: Strategy · RTS · Real Time Tactics

Company of Heroes 3
Shared: Strategy · RTS · Wargame

Syrian Warfare
Shared: RTS · Real Time Tactics · Wargame

Regiments
Shared: Strategy · Real Time Tactics · Wargame

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

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

Last Train Home
Shared: Strategy · RTS · Real Time Tactics

Commandos: Origins
Shared: Strategy · Real Time Tactics · RTS

Master of Command
Shared: Strategy · RTS · Real Time Tactics

Wargame: Airland Battle
Shared: Strategy · RTS · Wargame

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

Wargame: European Escalation
Shared: Strategy · RTS · Wargame

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

Dune: Spice Wars
Shared: RTS · Strategy · Management

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

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

Age of Empires III: Definitive Edition
Shared: Strategy · RTS · Military

Tempest Rising
Shared: Strategy · RTS · 3D

Defense Grid: The Awakening
Shared: Strategy · Aliens · Sci-fi

