Games like Cthulhu tower
Games like Cthulhu tower include Kingdom Rush Vengeance - Tower Defense, This War of Mine, Kingdom Rush Frontiers - Tower Defense, Bloons TD 6, and Desperados III. We matched them by the tags players give Cthulhu tower on Steam (Tower Defense, Real Time Tactics, Singleplayer, Strategy, and Management): closest matches first, and among equally close ones the better-known games.

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

This War of Mine
Shared: Singleplayer · Strategy · Atmospheric

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

Bloons TD 6
Shared: Tower Defense · Strategy · Singleplayer

Desperados III
Shared: Real Time Tactics · Strategy · Singleplayer

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

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

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

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

911 Operator
Shared: Strategy · Singleplayer · Management

Until We Die
Shared: Strategy · Tower Defense · Survival

Shadow Tactics: Aiko's Choice
Shared: Real Time Tactics · Strategy · Isometric

Last Train Home
Shared: Real Time Tactics · Strategy · Singleplayer

Kingdom Two Crowns
Shared: Tower Defense · Singleplayer · Strategy

Frostpunk
Shared: Strategy · Survival · Singleplayer

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

The Escapists
Shared: Strategy · Singleplayer · Difficult

Wall World
Shared: Tower Defense · Strategy · Difficult

The Witcher 3: Wild Hunt — Remastered
Shared: Atmospheric · Singleplayer · Choices Matter

RimWorld
Shared: Strategy · Singleplayer · Management

Lobotomy Corporation | Monster Management Simulation
Shared: Management · Difficult · Singleplayer

This Is the Police
Shared: Strategy · Management · Singleplayer

Oxygen Not Included
Shared: Singleplayer · Management · Survival

Frostpunk 2
Shared: Strategy · Singleplayer · Survival