Games like Scarecropia
Games like Scarecropia include Stronghold HD (2012), Stronghold Crusader: Definitive Edition, Stronghold: Definitive Edition, Thronefall, and Stronghold Crusader HD (2012). We matched them by the tags players give Scarecropia on Steam (Tactical RPG, Wargame, Action RTS, Real Time Tactics, and Tower Defense): closest matches first, and among equally close ones the better-known games.

Stronghold HD (2012)
Shared: Real Time Tactics · City Builder · Colony Sim

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

Stronghold: Definitive Edition
Shared: Real Time Tactics · City Builder · Sandbox

Thronefall
Shared: Tower Defense · Action RTS · City Builder

Stronghold Crusader HD (2012)
Shared: Real Time Tactics · City Builder · Colony Sim

Kingdom Two Crowns
Shared: Tower Defense · City Builder · Building

RimWorld
Shared: Colony Sim · Sandbox · Survival

Rise to Ruins
Shared: Tower Defense · City Builder · Colony Sim

They Are Billions
Shared: Colony Sim · Tower Defense · City Builder

Ultimate Epic Battle Simulator 2
Shared: Wargame · Sandbox · Action

Medieval Kingdom Wars
Shared: Action RTS · Wargame · City Builder

Bad North: Jotunn Edition
Shared: Wargame · Real Time Tactics · Tower Defense

Stronghold 2: Steam Edition
Shared: Real Time Tactics · City Builder · Sandbox

Creeper World 4
Shared: Wargame · Real Time Tactics · Tower Defense

Stronghold: Warlords
Shared: Real Time Tactics · City Builder · Colony Sim

Bee Island
Shared: Tower Defense · Action RTS · City Builder

Kingdom Heroes 8
Shared: Tactical RPG · Real Time Tactics · Wargame

Diplomacy is Not an Option
Shared: Medieval · Action RTS · Colony Sim

Going Medieval
Shared: Colony Sim · City Builder · Sandbox

9-Bit Armies: A Bit Too Far
Shared: Action RTS · Wargame · Real Time Tactics

Castle Story
Shared: Colony Sim · Sandbox · Tower Defense

Broken Arrow
Shared: Wargame · Real Time Tactics · Action RTS

The Riftbreaker
Shared: Tower Defense · Sandbox · Base Building

Kingdom Eighties
Shared: Action RTS · Tower Defense · City Builder

