Games like The Unearthened - Complete Edition
Games like The Unearthened - Complete Edition include Oxygen Not Included, Prison Architect, Frostpunk, Cities: Skylines, and (the) Gnorp Apologue. We matched them by the tags players give The Unearthened - Complete Edition on Steam (Tower Defense, Resource Management, Idler, Economy, and Aliens): closest matches first, and among equally close ones the better-known games.

Oxygen Not Included
Shared: Resource Management · Building · 2D

Prison Architect
Shared: Building · Resource Management · 2D

Frostpunk
Shared: Resource Management · Building · Survival

Cities: Skylines
Shared: Building · Economy · Resource Management

(the) Gnorp Apologue
Shared: Idler · Economy · Building

Jurassic World Evolution
Shared: Building · Economy · Resource Management

Jurassic World Evolution 2
Shared: Building · Resource Management · Economy

Factorio
Shared: Resource Management · Base Building · Building

Mindustry
Shared: Tower Defense · Resource Management · Building

Manor Lords
Shared: Resource Management · Building · Strategy

Captain of Industry
Shared: Resource Management · Economy · Building

Dyson Sphere Program
Shared: Resource Management · Building · Sci-fi

Cookie Clicker
Shared: Idler · Economy · Resource Management

Kingdoms and Castles
Shared: Resource Management · Building · Economy

Tower Wizard
Shared: Resource Management · Idler · 2D

Cities: Skylines II
Shared: Building · Economy · Resource Management

Against the Storm
Shared: Resource Management · Building · Strategy

Farthest Frontier
Shared: Resource Management · Building · Economy

Cliff Empire
Shared: Economy · Resource Management · Sci-fi

Workers & Resources: Soviet Republic
Shared: Building · Economy · Resource Management

Production Line : Car factory simulation
Shared: Economy · Resource Management · Building

Foundation
Shared: Resource Management · Building · Economy

News Tower
Shared: Resource Management · Building · Management

Empires of the Undergrowth
Shared: Building · Resource Management · Economy