Games like Zombie City Defense 2
Games like Zombie City Defense 2 include Men of War: Assault Squad 2, Arma 3, Call to Arms, Arma Reforger, and Arma 2: Operation Arrowhead. We matched them by the tags players give Zombie City Defense 2 on Steam (Strategy, Simulation, Action, Indie, and Zombies): closest matches first, and among equally close ones the better-known games.

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

Arma 3
Shared: Action · Simulation · Military

Call to Arms
Shared: Strategy · Action · Military

Arma Reforger
Shared: Simulation · Action · Strategy

Arma 2: Operation Arrowhead
Shared: Simulation · Action · Strategy

Wargame: Red Dragon
Shared: Strategy · Military · Tactical

Plague Inc: Evolved
Shared: Strategy · Simulation · Indie

Steel Division 2
Shared: Strategy · Simulation · Military

Hearts of Iron IV
Shared: Strategy · Simulation · War

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Indie

Bodycam
Shared: Tactical · Realistic · Military

Insurgency
Shared: Action · Tactical · Realistic

IRON NEST: Heavy Turret Simulator
Shared: Simulation · Military · Indie

Squad
Shared: Military · Realistic · Action

Hell Let Loose: Vietnam
Shared: Simulation · Strategy · Action

Total War: THREE KINGDOMS
Shared: Strategy · War · Military

Onward
Shared: Simulation · Action · Military

Steel Division: Normandy 44
Shared: Strategy · Simulation · Action

Company of Heroes 2
Shared: Strategy · Tactical · War

War Thunder
Shared: Action · Simulation · War

WARNO
Shared: Strategy · Military · Simulation

WARDOGS
Shared: Action · Military · Tactical

War of Rights
Shared: Action · Simulation · War

Door Kickers 2: Task Force North
Shared: Strategy · Tactical · Action