Games like Iron Heart
Games like Iron Heart include Kingdom Rush - Tower Defense, Rock 'N' Roll Defense, SMITE 2, Bloodstained: Ritual of the Night, and Monster Hunter: World. We matched them by the tags players give Iron Heart on Steam (Action, Casual, Adventure, RPG, and Strategy): closest matches first, and among equally close ones the better-known games.

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · Casual

Rock 'N' Roll Defense
Shared: Casual · Action · Strategy

SMITE 2
Shared: Action · Strategy · Adventure

Bloodstained: Ritual of the Night
Shared: Action · RPG · Adventure

Monster Hunter: World
Shared: Action · RPG · Adventure

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

Wuthering Waves
Shared: Action · RPG · Adventure

DAVE THE DIVER
Shared: Casual · Adventure · RPG

Plants vs. Zombies GOTY Edition
Shared: Casual · Tower Defense · Strategy

Bloons TD 6
Shared: Strategy · Tower Defense · Casual

Bloons TD 5
Shared: Action · Strategy · Tower Defense

Mount & Blade: Warband
Shared: RPG · Action · Strategy

Crimson Desert Enhanced
Shared: Action · Adventure · RPG

Tomb Raider Game of the Year
Shared: Action · Adventure · Exploration

Rise of the Tomb Raider™
Shared: Action · Adventure · Exploration

Caster
Shared: Action · Adventure · Casual

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Tower Defense · Casual

The Elder Scrolls Online - Standard Edition
Shared: RPG · Adventure · Action

Gothic 1 Remake
Shared: Adventure · Action · RPG

DRAGON BALL Z: KAKAROT
Shared: Action · RPG · Adventure

Fallout 4
Shared: RPG · Adventure · Exploration

Escape From Duckov
Shared: Action · Adventure · Exploration

Mount & Blade II: Bannerlord
Shared: Strategy · RPG · Action

Lost
Shared: Casual · Action · Adventure