Games like City Defense
Games like City Defense include Creeper World 4, Bloons TD 6, Door Kickers 2: Task Force North, WARNO, and Plants vs. Zombies GOTY Edition. We matched them by the tags players give City Defense on Steam (Indie, Strategy, Tower Defense, Casual, and Action): closest matches first, and among equally close ones the better-known games.

Creeper World 4
Shared: Tower Defense · Wargame · Strategy

Bloons TD 6
Shared: Strategy · Tower Defense · Casual

Door Kickers 2: Task Force North
Shared: Strategy · Real Time Tactics · Top-Down

WARNO
Shared: Strategy · Wargame · Real Time Tactics

Plants vs. Zombies GOTY Edition
Shared: Tower Defense · Strategy · Casual

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

Wargame: Red Dragon
Shared: Strategy · Wargame · Military

Rock 'N' Roll Defense
Shared: Strategy · Tower Defense · Casual

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

Minimalist Tower Defense
Shared: Strategy · Tower Defense · Real Time Tactics

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

Thronefall
Shared: Strategy · Tower Defense · Action

Ultimate Epic Battle Simulator 2
Shared: Strategy · Action · Wargame

Orcs Must Die! 3
Shared: Tower Defense · Strategy · Action

Broken Arrow
Shared: Strategy · Wargame · Real Time Tactics

Company of Heroes 3
Shared: Strategy · Wargame · Real Time Tactics

Bloons TD 5
Shared: Strategy · Tower Defense · Action

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

Taur
Shared: Strategy · Tower Defense · Indie

Plebby Quest: The Crusades
Shared: Strategy · Indie · Casual

Foxhole
Shared: Wargame · Strategy · Military

Infested Planet
Shared: Strategy · Tower Defense · Indie

Orcs Must Die! 2
Shared: Tower Defense · Strategy · Indie

Northend Tower Defense
Shared: Indie · Tower Defense · Strategy