Games like Universe Plan
Games like Universe Plan include Total War: WARHAMMER II, Kingdom Rush - Tower Defense, Total War: WARHAMMER III, Age of Empires II (Retired), and Company of Heroes 2. We matched them by the tags players give Universe Plan on Steam (Strategy, RTS, Tactical RPG, Singleplayer, and Relaxing): closest matches first, and among equally close ones the better-known games.

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

Kingdom Rush - Tower Defense
Shared: Strategy · Singleplayer · 2D

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

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

Company of Heroes 2
Shared: Strategy · RTS · Singleplayer

Circle Empires
Shared: Strategy · RTS · Singleplayer

The Last Spell
Shared: Strategy · Singleplayer · Tactical RPG

Age of Mythology: Extended Edition
Shared: Strategy · RTS · Singleplayer

Shadow Tactics: Blades of the Shogun
Shared: Strategy · Singleplayer · Tactical

Plague Inc: Evolved
Shared: Strategy · Singleplayer · Indie

Door Kickers
Shared: Strategy · Tactical · Singleplayer

STAR WARS™ Empire at War - Gold Pack
Shared: Strategy · RTS · Singleplayer

Aliens: Dark Descent
Shared: Strategy · RTS · Singleplayer

Warhammer 40,000: Dawn of War - Definitive Edition
Shared: Strategy · RTS · Singleplayer

The Banner Saga
Shared: Tactical RPG · Strategy · 2D

Warhammer 40,000: Dawn of War II - Anniversary Edition (Classic)
Shared: Strategy · RTS · Singleplayer

Kingdom Rush 5: Alliance TD
Shared: Strategy · Singleplayer · 2D

Total War: THREE KINGDOMS
Shared: Strategy · RTS · Singleplayer

Metal Slug Tactics
Shared: Strategy · Tactical RPG · Singleplayer

Starship Troopers: Terran Command
Shared: Strategy · RTS · Singleplayer

Warhammer 40,000: Dawn of War - Anniversary Edition (Classic)
Shared: Strategy · RTS · Singleplayer

Rusted Warfare - RTS
Shared: Strategy · RTS · 2D

Kingdom Rush Frontiers - Tower Defense
Shared: Strategy · Singleplayer · 2D

Kingdom Rush Origins - Tower Defense
Shared: Strategy · Singleplayer · 2D