Games like The Town is Overrun
Games like The Town is Overrun include Kingdom Rush - Tower Defense, Door Kickers, GemCraft - Chasing Shadows, Plants vs. Zombies GOTY Edition, and Shadow Tactics: Blades of the Shogun. We matched them by the tags players give The Town is Overrun on Steam (Strategy, Action, Tower Defense, 2D, and Real Time Tactics): closest matches first, and among equally close ones the better-known games.

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

Door Kickers
Shared: Strategy · Action · Tactical

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

Plants vs. Zombies GOTY Edition
Shared: Strategy · Tower Defense · 2D

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

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

Plague Inc: Evolved
Shared: Strategy · Simulation · Singleplayer

Aliens: Dark Descent
Shared: Strategy · Action · Tactical

Kingdom Rush 5: Alliance TD
Shared: Strategy · Tower Defense · 2D

Bloons TD 6
Shared: Strategy · Tower Defense · Singleplayer

DG2: Defense Grid 2
Shared: Strategy · Tower Defense · Action

911 Operator
Shared: Strategy · Singleplayer · Simulation

Infested Planet
Shared: Strategy · Action · Tower Defense

Police Stories
Shared: Strategy · Action · Tactical

The Escapists
Shared: Strategy · 2D · Action

Men of War: Assault Squad 2
Shared: Strategy · Action · Tactical

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

Taur
Shared: Strategy · Tower Defense · Action

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

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

Bloons TD 5
Shared: Strategy · Tower Defense · Action

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

Tangy TD
Shared: Strategy · Tower Defense · Action

Dome Keeper
Shared: Action · Singleplayer · Tower Defense