Games like Iron Brigade
Games like Iron Brigade include HELLDIVERS™ 2, Orcs Must Die! 2, EARTH DEFENSE FORCE 4.1 The Shadow of New Despair, Orcs Must Die! 3, and Bloons TD 6. We matched them by the tags players give Iron Brigade on Steam (Action, Tower Defense, Strategy, Mechs, and Third-Person Shooter): closest matches first, and among equally close ones the better-known games.

HELLDIVERS™ 2
Shared: Action · Third-Person Shooter · Online Co-Op

Orcs Must Die! 2
Shared: Tower Defense · Action · Strategy

EARTH DEFENSE FORCE 4.1 The Shadow of New Despair
Shared: Action · Co-op · Third-Person Shooter

Orcs Must Die! 3
Shared: Tower Defense · Strategy · Co-op

Bloons TD 6
Shared: Tower Defense · Strategy · Co-op

EARTH DEFENSE FORCE 5
Shared: Action · Mechs · Co-op

Saints Row: The Third
Shared: Action · Co-op · Third-Person Shooter

Sanctum 2
Shared: Tower Defense · Action · Strategy

PUBG: BATTLEGROUNDS
Shared: Action · Third-Person Shooter · Shooter

Bloons TD 5
Shared: Tower Defense · Strategy · Action

Orcs Must Die! Deathtrap
Shared: Tower Defense · Action · Co-op

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

STAR WARS™ Battlefront™ II
Shared: Action · Third-Person Shooter · Sci-fi

HELLDIVERS™ Dive Harder Edition
Shared: Co-op · Action · Online Co-Op

Saints Row IV: Re-Elected
Shared: Action · Co-op · Third-Person Shooter

Warhammer 40,000: Space Marine 2
Shared: Action · Co-op · Third-Person Shooter

Warframe
Shared: Action · Third-Person Shooter · Co-op

EARTH DEFENSE FORCE 6
Shared: Action · Third-Person Shooter · Sci-fi

Borderlands 2
Shared: Action · Co-op · Shooter

Dead Space™ 3
Shared: Action · Co-op · Online Co-Op

PAYDAY 2
Shared: Action · Co-op · Online Co-Op

Plants vs. Zombies: Battle for Neighborville™
Shared: Third-Person Shooter · Tower Defense · Action

Borderlands: The Pre-Sequel
Shared: Action · Co-op · Comedy

Aliens: Fireteam Elite
Shared: Action · Co-op · Third-Person Shooter