Games like Mighty Castles
Games like Mighty Castles include 7 Days to Die, Project Zomboid, Kenshi, Infestation: The New Beginning, and Dying Light. We matched them by the tags players give Mighty Castles on Steam (RPG, Zombies, Survival, Strategy RPG, and CRPG): closest matches first, and among equally close ones the better-known games.

7 Days to Die
Shared: Zombies · Survival · RPG

Project Zomboid
Shared: Zombies · Survival · RPG

Kenshi
Shared: RPG · Survival · Strategy RPG

Infestation: The New Beginning
Shared: Zombies · Survival · RPG

Dying Light
Shared: Zombies · Survival · RPG

How to Survive
Shared: Zombies · Survival · RPG

SurrounDead
Shared: Zombies · Survival · RPG

DYSMANTLE
Shared: Survival · Zombies · RPG

Pathfinder: Kingmaker - Enhanced Plus Edition
Shared: RPG · CRPG · Strategy RPG

Plants vs. Zombies GOTY Edition
Shared: Zombies · Tower Defense · Survival

Night of the Dead
Shared: Zombies · Tower Defense · Survival

DayZ
Shared: Survival · Zombies

Dread Dawn
Shared: Zombies · Survival · RPG

Dead Age
Shared: RPG · Zombies · Survival

State of Decay: YOSE
Shared: Zombies · Survival · RPG

They Are Billions
Shared: Zombies · Survival · Tower Defense

ATOM RPG: Post-apocalyptic indie game
Shared: RPG · CRPG · Survival

How to Survive 2
Shared: Zombies · Survival · RPG

VEIN
Shared: Survival · Zombies · RPG

Baldur's Gate 3
Shared: RPG · CRPG

Left 4 Dead 2
Shared: Zombies · Survival

Survivalist
Shared: Zombies · RPG · Survival

Dead State: Reanimated
Shared: Zombies · RPG · Survival

HumanitZ
Shared: Zombies · Survival · RPG