Games like IRON GUARD: Day Zero
Games like IRON GUARD: Day Zero include Age of Darkness: Final Stand, Thronefall, Taur, DG2: Defense Grid 2, and Kingdom Rush 6: Genesis TD. We matched them by the tags players give IRON GUARD: Day Zero on Steam (Top-Down Shooter, Strategy, Action RTS, Tower Defense, and Action): closest matches first, and among equally close ones the better-known games.

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

Thronefall
Shared: Strategy · Tower Defense · Action RTS

Taur
Shared: Strategy · Tower Defense · Action

DG2: Defense Grid 2
Shared: Strategy · Tower Defense · Action

Kingdom Rush 6: Genesis TD
Shared: Strategy · Tower Defense · Action

Mindustry
Shared: Tower Defense · Strategy · RTS

Command & Conquer 3 Tiberium Wars™
Shared: Strategy · Action · RTS

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

X-Morph: Defense
Shared: Strategy · Tower Defense · Action

Warhammer 40,000: Dawn of War - Definitive Edition
Shared: Strategy · RTS · Action RTS

Cossacks 3
Shared: Strategy · RTS · Action RTS

Infested Planet
Shared: Strategy · Tower Defense · Action

Aliens: Dark Descent
Shared: Strategy · Action · RTS

Age of Mythology: Retold
Shared: Strategy · RTS · Base Building

Warhammer 40,000: Dawn of War III
Shared: Strategy · RTS · Action

Halo: Spartan Assault
Shared: Top-Down Shooter · Action · Strategy

Tempest Rising
Shared: Strategy · RTS · Base Building

Bee Island
Shared: Strategy · Tower Defense · Action RTS

Creeper World 3: Arc Eternal
Shared: Strategy · Tower Defense · RTS

Defense Grid: The Awakening
Shared: Strategy · Tower Defense · Action

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

Command & Conquer Red Alert™ 2 and Yuri’s Revenge™
Shared: Strategy · Action · RTS

They Are Billions
Shared: Strategy · Tower Defense · RTS

EverSiege: Untold Ages
Shared: Action RTS · Tower Defense · Strategy