Games like Who Guards the Demon Castle?
Games like Who Guards the Demon Castle? include RimWorld, Game Dev Tycoon, Prison Architect, Oxygen Not Included, and 911 Operator. We matched them by the tags players give Who Guards the Demon Castle? on Steam (Real Time Tactics, Strategy, Auto Battler, Tower Defense, and Simulation): closest matches first, and among equally close ones the better-known games.

RimWorld
Shared: Strategy · Base Building · Management

Game Dev Tycoon
Shared: Strategy · Simulation · Management

Prison Architect
Shared: Simulation · Strategy · Base Building

Oxygen Not Included
Shared: Base Building · Management · Strategy

911 Operator
Shared: Strategy · Simulation · Management

Manor Lords
Shared: Strategy · Simulation · Base Building

Northend Tower Defense
Shared: Strategy · Tower Defense · Auto Battler

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

Teamfight Manager
Shared: Simulation · Auto Battler · Management

Thronefall
Shared: Strategy · Tower Defense · Base Building

Stronghold: Definitive Edition
Shared: Strategy · Real Time Tactics · Tower Defense

Against the Storm
Shared: Strategy · Simulation · Base Building

Legion TD 2 - Multiplayer Tower Defense
Shared: Tower Defense · Auto Battler · Strategy

Factorio
Shared: Strategy · Base Building · Management

Stronghold Crusader: Definitive Edition
Shared: Strategy · Real Time Tactics · Tower Defense

Production Line : Car factory simulation
Shared: Strategy · Simulation · Management

Mini Motorways
Shared: Strategy · Simulation · Management

Minimalist Tower Defense
Shared: Strategy · Real Time Tactics · Tower Defense

Dwarf Fortress
Shared: Strategy · Simulation · Base Building

Lobotomy Corporation | Monster Management Simulation
Shared: Management · Simulation · Strategy

Dungeons 3
Shared: Strategy · Simulation · Base Building

Workers & Resources: Soviet Republic
Shared: Strategy · Simulation · Base Building

Bloons TD 6
Shared: Strategy · Tower Defense · 2D

Cities: Skylines
Shared: Strategy · Simulation · Management