Games like Four Mini Kingdoms War
Games like Four Mini Kingdoms War include Stronghold: Definitive Edition, Stronghold Crusader: Definitive Edition, Stronghold HD (2012), Mindustry, and The King is Watching. We matched them by the tags players give Four Mini Kingdoms War on Steam (RTS, Tower Defense, Base Building, 2D, and Top-Down): closest matches first, and among equally close ones the better-known games.

Stronghold: Definitive Edition
Shared: RTS · Strategy · City Builder

Stronghold Crusader: Definitive Edition
Shared: Strategy · Tower Defense · City Builder

Stronghold HD (2012)
Shared: Tower Defense · RTS · City Builder

Mindustry
Shared: Tower Defense · Base Building · RTS

The King is Watching
Shared: RTS · Tower Defense · Base Building

They Are Billions
Shared: Base Building · RTS · Tower Defense

Rusted Warfare - RTS
Shared: RTS · Base Building · 2D

Border Pioneer
Shared: Tower Defense · Base Building · RTS

Age of Empires III: Definitive Edition
Shared: RTS · Base Building · Strategy

Stronghold Crusader HD (2012)
Shared: Base Building · City Builder · Real Time Tactics

Age of Empires II (Retired)
Shared: RTS · Strategy · Base Building

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

Becastled
Shared: Base Building · RTS · Strategy

Farthest Frontier
Shared: Strategy · City Builder · Economy

Prison Architect
Shared: Base Building · 2D · Strategy

Creeper World 4
Shared: Tower Defense · RTS · Wargame

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

Planetary Annihilation: TITANS
Shared: RTS · Base Building · Strategy

Minimalist Tower Defense
Shared: Tower Defense · 2D · Top-Down

Age of Empires: Definitive Edition
Shared: RTS · Base Building · Strategy

Rise to Ruins
Shared: Tower Defense · Base Building · Strategy

Thronefall
Shared: Tower Defense · Strategy · Base Building

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

Medieval Kingdom Wars
Shared: RTS · Base Building · Economy