Games like TowerMancer
Games like TowerMancer include Total War: WARHAMMER II, Oxygen Not Included, Total War: WARHAMMER III, Mindustry, and Planetary Annihilation: TITANS. We matched them by the tags players give TowerMancer on Steam (RTS, Action, Building, Pixel Graphics, and Resource Management): closest matches first, and among equally close ones the better-known games.

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

Oxygen Not Included
Shared: Building · Resource Management · Singleplayer

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

Mindustry
Shared: RTS · Resource Management · Building

Planetary Annihilation: TITANS
Shared: RTS · Strategy · Building

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

Tower Wizard
Shared: Resource Management · Strategy · Pixel Graphics

Kingdom Rush 5: Alliance TD
Shared: Strategy · Singleplayer · Building

Farthest Frontier
Shared: Building · Resource Management · Strategy

Factorio
Shared: Resource Management · Strategy · Building

Age of Mythology: Retold
Shared: RTS · Strategy · Resource Management

Cities: Skylines
Shared: Building · Strategy · Singleplayer

The Escapists
Shared: Pixel Graphics · Strategy · Action

Tooth and Tail
Shared: RTS · Pixel Graphics · Strategy

The King is Watching
Shared: RTS · Strategy · Fantasy

Stronghold: Definitive Edition
Shared: RTS · Building · Strategy

Aliens: Dark Descent
Shared: Action · RTS · Strategy

Frostpunk
Shared: Resource Management · Strategy · Building

Tavern Master
Shared: Building · Resource Management · Strategy

Skul: The Hero Slayer
Shared: Action · Pixel Graphics · Singleplayer

Sheltered
Shared: Pixel Graphics · Strategy · Resource Management

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

Jurassic World Evolution
Shared: Building · Strategy · Singleplayer

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