Games like Forward Defense
Games like Forward Defense include Squad, XCOM 2, Warhammer 40,000: Chaos Gate - Daemonhunters, Battle Brothers, and Age of Darkness: Final Stand. We matched them by the tags players give Forward Defense on Steam (Tower Defense, 3D, Military, Realistic, and PvE): closest matches first, and among equally close ones the better-known games.

Squad
Shared: Military · Realistic · PvE

XCOM 2
Shared: Strategy · Turn-Based Tactics · Military

Warhammer 40,000: Chaos Gate - Daemonhunters
Shared: Turn-Based Tactics · Turn-Based Strategy · 3D

Battle Brothers
Shared: Turn-Based Tactics · Turn-Based Strategy · Strategy

Age of Darkness: Final Stand
Shared: Tower Defense · 3D · Action RTS

IRON NEST: Heavy Turret Simulator
Shared: Military · Realistic · 3D

Arma 3
Shared: Military · Realistic · Action

Thronefall
Shared: Tower Defense · Strategy · 3D

STAR WARS Zero Company™
Shared: Turn-Based Tactics · Turn-Based Strategy · Strategy

Jagged Alliance 3
Shared: Turn-Based Tactics · Strategy · Turn-Based Strategy

Broken Arrow
Shared: Strategy · Realistic · Action RTS

Arma Reforger
Shared: Military · Realistic · Strategy

MENACE
Shared: Turn-Based Tactics · Turn-Based Strategy · Strategy

Orcs Must Die! 3
Shared: Tower Defense · PvE · Strategy

Warhammer 40,000: Battlesector
Shared: 3D · Turn-Based Tactics · Turn-Based Strategy

ROMANCE OF THE THREE KINGDOMS XIV
Shared: Military · Turn-Based Tactics · 3D

WARDOGS
Shared: Military · Realistic · Action

Insurgency
Shared: Realistic · Military · Action

The Last Spell
Shared: Turn-Based Strategy · Turn-Based Tactics · Strategy

Inkbound
Shared: Turn-Based Tactics · PvE · Turn-Based Strategy

Sir, We Have an Orc Problem
Shared: Tower Defense · Military · PvE

Bloons TD 6
Shared: Tower Defense · 3D · Strategy

Company of Heroes 3
Shared: Strategy · Action RTS · PvE

Total War: THREE KINGDOMS
Shared: Military · Strategy · Turn-Based Strategy