Games like Flotsam: Support Pack
Games like Flotsam: Support Pack include Flotsam, Factorio, Timberborn, RimWorld, and Oxygen Not Included. We matched them by the tags players give Flotsam: Support Pack on Steam (Base Building, Colony Sim, Sandbox, City Builder, and Resource Management): closest matches first, and among equally close ones the better-known games.

Flotsam
Shared: Base Building · Colony Sim · Sandbox

Factorio
Shared: Base Building · Sandbox · Automation

Timberborn
Shared: Colony Sim · City Builder · Sandbox

RimWorld
Shared: Base Building · Colony Sim · Sandbox

Oxygen Not Included
Shared: Base Building · Colony Sim · Resource Management

Dwarf Fortress
Shared: Colony Sim · Base Building · City Builder

Satisfactory
Shared: Base Building · Automation · Open World

Kingdoms and Castles
Shared: Colony Sim · City Builder · Resource Management

Frostpunk
Shared: City Builder · Resource Management · Colony Sim

Manor Lords
Shared: Base Building · City Builder · Sandbox

Banished
Shared: Colony Sim · City Builder · Sandbox

Dyson Sphere Program
Shared: Base Building · Automation · Resource Management

Against the Storm
Shared: Base Building · City Builder · Colony Sim

Space Haven
Shared: Base Building · Colony Sim · Survival

Prison Architect
Shared: Base Building · Sandbox · Colony Sim

Endzone - A World Apart
Shared: City Builder · Base Building · Survival

Empires of the Undergrowth
Shared: Base Building · City Builder · Colony Sim

The Crust
Shared: Base Building · Colony Sim · Sandbox

Settlement Survival
Shared: Colony Sim · City Builder · Sandbox

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

Dawn of Man
Shared: Colony Sim · City Builder · Sandbox

Workers & Resources: Soviet Republic
Shared: Base Building · City Builder · Colony Sim

The Wandering Village
Shared: City Builder · Colony Sim · Resource Management

Planetbase
Shared: Colony Sim · Base Building · City Builder