Games like The Iron Union
Games like The Iron Union include Escape From Duckov, Minishoot' Adventures, Halo: Spartan Assault, Cyberhunt, and Commando Collection. We matched them by the tags players give The Iron Union on Steam (Adventure, Shooter, Arcade, 3D Platformer, and Top-Down Shooter): closest matches first, and among equally close ones the better-known games.

Escape From Duckov
Shared: Adventure · Shooter · Top-Down Shooter

Minishoot' Adventures
Shared: Adventure · Twin Stick Shooter · Bullet Hell

Halo: Spartan Assault
Shared: Top-Down Shooter · Shooter · Twin Stick Shooter

Cyberhunt
Shared: Adventure · Arcade · Twin Stick Shooter

Commando Collection
Shared: Shooter · Arcade · Bullet Hell

Relic Hunters Zero: Remix
Shared: Adventure · Twin Stick Shooter · Top-Down Shooter

KILL KNIGHT
Shared: Arcade · Top-Down Shooter · Bullet Hell

The Ascent
Shared: Top-Down Shooter · Shooter · Adventure

Hell Let Loose
Shared: Shooter · Realistic · World War II

Sky Force Reloaded
Shared: Arcade · Top-Down Shooter · Bullet Hell

Exit the Gungeon
Shared: Arcade · Adventure · Bullet Hell

Insect Swarm
Shared: Shooter · Top-Down Shooter · Top-Down

Arma 3
Shared: Shooter · Realistic · Action

Nex Machina
Shared: Arcade · Twin Stick Shooter · Bullet Hell

BALL x PIT
Shared: Arcade · Bullet Hell · Top-Down Shooter

Chippy
Shared: Twin Stick Shooter · Bullet Hell · Top-Down Shooter

Red Dead Redemption 2
Shared: Adventure · Shooter · Realistic

Enter the Gungeon
Shared: Bullet Hell · Twin Stick Shooter · Adventure

Waves
Shared: Shooter · Arcade · Bullet Hell

12 is Better Than 6
Shared: Shooter · Top-Down Shooter · Adventure

Ready or Not
Shared: Shooter · Realistic · Adventure

The Hong Kong Massacre
Shared: Top-Down Shooter · Shooter · Twin Stick Shooter

Splatter - Zombiecalypse Now
Shared: Top-Down Shooter · Adventure · Top-Down

Flashing Lights - Police, Firefighting, Emergency Services (EMS) Simulator
Shared: Adventure · Shooter · Simulation