Games like City Retreat
Games like City Retreat include Plants vs. Zombies GOTY Edition, Plague Inc: Evolved, They Are Billions, Iron Marines, and Cepheus Protocol. We matched them by the tags players give City Retreat on Steam (Adventure, Strategy, RTS, Top-Down Shooter, and Zombies): closest matches first, and among equally close ones the better-known games.

Plants vs. Zombies GOTY Edition
Shared: Strategy · Zombies · Singleplayer

Plague Inc: Evolved
Shared: Strategy · Zombies · Singleplayer

They Are Billions
Shared: Strategy · Zombies · RTS

Iron Marines
Shared: Strategy · RTS · Adventure

Cepheus Protocol
Shared: RTS · Zombies · Strategy

Command & Conquer™ 4 Tiberian Twilight
Shared: Strategy · Adventure · RTS

Age of Empires III: Definitive Edition
Shared: Strategy · RTS · Singleplayer

Totally Accurate Battle Simulator
Shared: Strategy · Adventure · Singleplayer

Organ Trail: Director's Cut
Shared: Strategy · Zombies · Indie

Sands of Salzaar
Shared: Strategy · Adventure · Indie

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

20 Minutes Till Dawn
Shared: Top-Down Shooter · Combat · Adventure

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

Cossacks 3
Shared: Strategy · RTS · Singleplayer

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

Dead Age
Shared: Strategy · Zombies · Adventure

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

Sultan's Game
Shared: Strategy · Adventure · Singleplayer

Mount & Blade II: Bannerlord
Shared: Strategy · Singleplayer · Adventure

Infection Free Zone
Shared: Strategy · Zombies · RTS

Company of Heroes 2
Shared: Strategy · RTS · Singleplayer

The Last Stand: Aftermath
Shared: Zombies · Top-Down Shooter · Adventure

Call to Arms - Gates of Hell: Ostfront
Shared: Strategy · RTS · Singleplayer

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