Games like Sunbreak War
Games like Sunbreak War include Stronghold Crusader HD (2012), Stronghold Crusader: Definitive Edition, Thronefall, Creeper World 4, and The King is Watching. We matched them by the tags players give Sunbreak War on Steam (Roguelite, Tower Defense, Real Time Tactics, City Builder, and Wargame): closest matches first, and among equally close ones the better-known games.

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

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

Thronefall
Shared: Tower Defense · City Builder · Medieval

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

The King is Watching
Shared: Tower Defense · Roguelike · Roguelite

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

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

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

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

Rogue Tower
Shared: Tower Defense · Roguelike · Roguelite

Nordhold
Shared: Tower Defense · Roguelite · Roguelike

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

Stronghold: Warlords
Shared: Real Time Tactics · City Builder · Medieval

Sir, We Have an Orc Problem
Shared: Tower Defense · Roguelite · Military

WARNO
Shared: Real Time Tactics · Wargame · Military

Becastled
Shared: City Builder · Medieval · Base Building

Border Pioneer
Shared: Tower Defense · City Builder · Medieval

The Lost Village
Shared: Roguelite · City Builder · Real Time Tactics

Foundation
Shared: City Builder · Medieval · Building

Tower Dominion
Shared: Tower Defense · Roguelite · Roguelike

Drill Core
Shared: Roguelite · Tower Defense · City Builder

Emberward
Shared: Tower Defense · Roguelite · Strategy

Farthest Frontier
Shared: City Builder · Medieval · Building

Tabletop Tavern
Shared: Roguelite · Real Time Tactics · Wargame