Games like Age of Goblins
Games like Age of Goblins include Total War: WARHAMMER III, Total War: WARHAMMER II, Bloons TD 6, Kingdom Rush - Tower Defense, and Dune: Spice Wars. We matched them by the tags players give Age of Goblins on Steam (RTS, 4X, Strategy, Difficult, and Real Time Tactics): closest matches first, and among equally close ones the better-known games.

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

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

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

Kingdom Rush - Tower Defense
Shared: Strategy · Tower Defense · Singleplayer

Dune: Spice Wars
Shared: RTS · Management · Strategy

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Difficult · Tower Defense

Company of Heroes 3
Shared: Strategy · RTS · Action RTS

GemCraft - Frostborn Wrath
Shared: RTS · Difficult · Strategy

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Difficult · Tower Defense

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

Broken Arrow
Shared: Strategy · RTS · Real Time Tactics

Game Dev Tycoon
Shared: Strategy · Management · Singleplayer

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

Diplomacy is Not an Option
Shared: RTS · Resource Management · Difficult

They Are Billions
Shared: Strategy · RTS · Tower Defense

Age of Mythology: Retold
Shared: RTS · Strategy · Resource Management

Total War: ROME REMASTERED
Shared: Strategy · RTS · 4X

Kingdom Rush Vengeance - Tower Defense
Shared: Strategy · Difficult · Tower Defense

Artisan TD
Shared: Strategy · Difficult · Tower Defense

Mud and Blood
Shared: RTS · Difficult · Real Time Tactics

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · Singleplayer

Cossacks 3
Shared: RTS · Strategy · Resource Management

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

Kingdoms and Castles
Shared: Strategy · Management · Resource Management