Games like Mission: Rift seeker
Games like Mission: Rift seeker include Oxygen Not Included, RimWorld, Prison Architect, Dwarf Fortress, and Kingdoms and Castles. We matched them by the tags players give Mission: Rift seeker on Steam (Simulation, Colony Sim, Base Building, Building, and Creature Collector): closest matches first, and among equally close ones the better-known games.

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

RimWorld
Shared: Colony Sim · Base Building · Simulation

Prison Architect
Shared: Simulation · Building · Base Building

Dwarf Fortress
Shared: Colony Sim · Simulation · Base Building

Kingdoms and Castles
Shared: Colony Sim · Simulation · Management

Manor Lords
Shared: Simulation · Base Building · Building

Against the Storm
Shared: Simulation · Base Building · Building

Space Haven
Shared: Colony Sim · Base Building · Simulation

Factorio
Shared: Base Building · Sandbox · Management

Empires of the Undergrowth
Shared: Simulation · Base Building · Colony Sim

Ratopia
Shared: Colony Sim · Building · Base Building

Settlement Survival
Shared: Colony Sim · Building · Simulation

Timberborn
Shared: Colony Sim · Building · Sandbox

Workers & Resources: Soviet Republic
Shared: Simulation · Base Building · Building

Academia : School Simulator
Shared: Colony Sim · Simulation · Base Building

Frostpunk
Shared: Colony Sim · Survival · Building

Norland
Shared: Simulation · Base Building · Colony Sim

Banished
Shared: Colony Sim · Simulation · Survival

Endzone - A World Apart
Shared: Simulation · Base Building · Colony Sim

Ostriv
Shared: Simulation · Colony Sim · Building

Space Engineers
Shared: Building · Simulation · Sandbox

Foundation
Shared: Simulation · Management · Sandbox

Founders' Fortune
Shared: Colony Sim · Base Building · Simulation

Cities: Skylines
Shared: Simulation · Building · Management