Games like Alien Horizon - Small Donation
Games like Alien Horizon - Small Donation include Frostpunk, RimWorld, Manor Lords, Oxygen Not Included, and Against the Storm. We matched them by the tags players give Alien Horizon - Small Donation on Steam (Strategy, Simulation, Free to Play, City Builder, and Colony Sim): closest matches first, and among equally close ones the better-known games.

Frostpunk
Shared: Strategy · City Builder · Survival

RimWorld
Shared: Strategy · Colony Sim · Survival

Manor Lords
Shared: Strategy · Simulation · City Builder

Oxygen Not Included
Shared: Colony Sim · Survival · Base Building

Against the Storm
Shared: Strategy · Simulation · City Builder

Prison Architect
Shared: Simulation · Strategy · Building

Banished
Shared: Strategy · City Builder · Simulation

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

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

Kingdoms and Castles
Shared: City Builder · Simulation · Colony Sim

Dwarf Fortress
Shared: Simulation · Strategy · Colony Sim

IXION
Shared: Strategy · City Builder · Colony Sim

Space Haven
Shared: Strategy · Colony Sim · Simulation

Planetbase
Shared: City Builder · Strategy · Colony Sim

Ostriv
Shared: Strategy · Simulation · City Builder

Norland
Shared: Strategy · Simulation · City Builder

Cities: Skylines
Shared: Simulation · City Builder · Strategy

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

They Are Billions
Shared: Strategy · Colony Sim · Base Building

Settlement Survival
Shared: City Builder · Colony Sim · Simulation

Frostpunk 2
Shared: Strategy · City Builder · Simulation

Cliff Empire
Shared: Strategy · Simulation · City Builder

Timberborn
Shared: City Builder · Colony Sim · Building

Dyson Sphere Program
Shared: Simulation · Building · Base Building