Games like Random Realms Hero Under Siege
Games like Random Realms Hero Under Siege include Kingdom Rush - Tower Defense, GemCraft - Chasing Shadows, Kingdom Rush 6: Genesis TD, Kingdom Rush 5: Alliance TD, and Mindustry. We matched them by the tags players give Random Realms Hero Under Siege on Steam (Action, 2D, Strategy, Top-Down, and Tower Defense): closest matches first, and among equally close ones the better-known games.

Kingdom Rush - Tower Defense
Shared: Strategy · 2D · Tower Defense

GemCraft - Chasing Shadows
Shared: Strategy · Action · Tower Defense

Kingdom Rush 6: Genesis TD
Shared: Action · Strategy · 2D

Kingdom Rush 5: Alliance TD
Shared: Strategy · 2D · Tower Defense

Mindustry
Shared: Tower Defense · Strategy · RTS

Infested Planet
Shared: Action · Strategy · Tower Defense

Thronefall
Shared: Strategy · Tower Defense · Action

Kingdom Rush Origins - Tower Defense
Shared: 2D · Strategy · Tower Defense

Kingdom Rush Frontiers - Tower Defense
Shared: 2D · Strategy · Tower Defense

GemCraft - Frostborn Wrath
Shared: Tower Defense · Strategy · 2D

Age of Darkness: Final Stand
Shared: Tower Defense · Strategy · PvE

Total War: WARHAMMER II
Shared: Strategy · Action · RTS

Door Kickers
Shared: Strategy · Action · Top-Down

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

The Escapists
Shared: Strategy · 2D · Action

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

Company of Heroes 3
Shared: Strategy · Singleplayer · RTS

The Last Spell
Shared: Strategy · RPG · Singleplayer

Plants vs. Zombies GOTY Edition
Shared: Strategy · Tower Defense · 2D

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

Kingdom Rush Vengeance - Tower Defense
Shared: Strategy · 2D · Tower Defense

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

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

Cossacks 3
Shared: Strategy · RTS · Singleplayer