Games like Island Crusaders
Games like Island Crusaders include Age of Darkness: Final Stand, Total War: WARHAMMER III, Door Kickers 2: Task Force North, Creeper World 4, and Northend Tower Defense. We matched them by the tags players give Island Crusaders on Steam (Real Time Tactics, RTS, Tower Defense, Cute, and Indie): closest matches first, and among equally close ones the better-known games.

Age of Darkness: Final Stand
Shared: Tower Defense · RTS · Action RTS

Total War: WARHAMMER III
Shared: RTS · Real Time Tactics · Strategy

Door Kickers 2: Task Force North
Shared: Real Time Tactics · Tactical · Indie

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

Northend Tower Defense
Shared: Tower Defense · Indie · Real Time Tactics

Total War: WARHAMMER II
Shared: RTS · Fantasy · Strategy

Company of Heroes 3
Shared: RTS · Action RTS · Real Time Tactics

Element TD 2 - Tower Defense
Shared: Real Time Tactics · Tower Defense · PvE

EverSiege: Untold Ages
Shared: Action RTS · Tower Defense · PvE

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

Door Kickers
Shared: Indie · Strategy · Tactical

Shadow Tactics: Blades of the Shogun
Shared: Real Time Tactics · Indie · Strategy

Aliens: Dark Descent
Shared: RTS · Real Time Tactics · Strategy

Toy Shire: Room One
Shared: Tower Defense · RTS · Real Time Tactics

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

Artisan TD
Shared: Tower Defense · Real Time Tactics · Strategy

The King is Watching
Shared: Tower Defense · RTS · Fantasy

Men of War: Assault Squad 2
Shared: RTS · Real Time Tactics · Strategy

Lessaria: Fantasy Kingdom Sim
Shared: RTS · Tower Defense · Strategy

Warhammer Age of Sigmar: Realms of Ruin
Shared: RTS · Real Time Tactics · Action RTS

DG2: Defense Grid 2
Shared: Tower Defense · RTS · Real Time Tactics

Sudden Strike 4
Shared: RTS · Real Time Tactics · Action RTS

GemCraft - Chasing Shadows
Shared: Tower Defense · Indie · Strategy

Touhou Monster TD ~ 幻想乡妖怪塔防
Shared: Tower Defense · Real Time Tactics · Action RTS