Games like Spiritlands
Games like Spiritlands include Frostpunk, Banished, This War of Mine, Manor Lords, and Endzone - A World Apart. We matched them by the tags players give Spiritlands on Steam (Strategy, Adventure, Indie, Casual, and Simulation): closest matches first, and among equally close ones the better-known games.

Frostpunk
Shared: Strategy · Resource Management · Survival

Banished
Shared: Strategy · Simulation · Indie

This War of Mine
Shared: Strategy · Survival · Simulation

Manor Lords
Shared: Strategy · Simulation · City Builder

Endzone - A World Apart
Shared: Strategy · Survival · City Builder

Oxygen Not Included
Shared: Resource Management · Survival · Base Building

Frostpunk 2
Shared: Strategy · City Builder · Resource Management

Against the Storm
Shared: Strategy · Simulation · City Builder

Kingdoms and Castles
Shared: Strategy · Resource Management · City Builder

Factorio
Shared: Strategy · Resource Management · Base Building

Home Behind
Shared: Adventure · Indie · Strategy

Mini Motorways
Shared: Strategy · Casual · Simulation

Dwarf Fortress
Shared: Strategy · Simulation · Base Building

Mr. Prepper
Shared: Simulation · Survival · Adventure

Cities: Skylines
Shared: Strategy · Simulation · City Builder

Foundation
Shared: Strategy · Simulation · City Builder

IXION
Shared: Strategy · City Builder · Resource Management

RimWorld
Shared: Strategy · Survival · Base Building

Workers & Resources: Soviet Republic
Shared: Strategy · Simulation · City Builder

Plague Inc: Evolved
Shared: Strategy · Indie · Simulation

Ostriv
Shared: Strategy · Simulation · City Builder

Planetbase
Shared: Strategy · City Builder · Simulation

Empires of the Undergrowth
Shared: Strategy · Simulation · City Builder

Dawn of Man
Shared: Strategy · City Builder · Simulation