Games like Giant Defense
Games like Giant Defense include Ultimate Epic Battle Simulator 2, Men of War: Assault Squad 2, Wargame: Red Dragon, Quarantine Zone: The Last Check, and Arma Reforger. We matched them by the tags players give Giant Defense on Steam (Simulation, Strategy, God Game, RTS, and Tower Defense): closest matches first, and among equally close ones the better-known games.

Ultimate Epic Battle Simulator 2
Shared: Simulation · Strategy · God Game

Men of War: Assault Squad 2
Shared: Strategy · Simulation · RTS

Wargame: Red Dragon
Shared: Strategy · RTS · Simulation

Quarantine Zone: The Last Check
Shared: Simulation · 3D · Strategy

Arma Reforger
Shared: Simulation · Strategy · Realistic

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

Planet Coaster 2
Shared: Simulation · Strategy · God Game

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Realistic

Broken Arrow
Shared: Strategy · RTS · Real Time Tactics

Dungeons 3
Shared: Strategy · Simulation · RTS

Lessaria: Fantasy Kingdom Sim
Shared: Strategy · Simulation · RTS

Creeper World 4
Shared: Tower Defense · RTS · Strategy

Crusader Kings III
Shared: Strategy · Simulation · RTS

Call to Arms
Shared: Strategy · RTS · Simulation

Total War: WARHAMMER
Shared: Strategy · Simulation · RTS

WARNO
Shared: Strategy · RTS · Real Time Tactics

Carrier Command 2
Shared: Simulation · Strategy · RTS

Stronghold: Definitive Edition
Shared: Strategy · RTS · Real Time Tactics

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

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

Wargame: European Escalation
Shared: Strategy · RTS · Simulation

Stronghold Crusader: Definitive Edition
Shared: Strategy · Real Time Tactics · Tower Defense

Hearts of Iron IV
Shared: Strategy · Simulation · RTS

Wargame: Airland Battle
Shared: Strategy · RTS · Simulation