Games like Echo Harvest
Games like Echo Harvest include Oxygen Not Included, RimWorld, Frostpunk, Prison Architect, and Against the Storm. We matched them by the tags players give Echo Harvest on Steam (Colony Sim, Base Building, Resource Management, Strategy, and Simulation): closest matches first, and among equally close ones the better-known games.

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

RimWorld
Shared: Colony Sim · Base Building · Strategy

Frostpunk
Shared: Resource Management · Colony Sim · Strategy

Prison Architect
Shared: Base Building · Colony Sim · Simulation

Against the Storm
Shared: Strategy · Base Building · Simulation

Dwarf Fortress
Shared: Colony Sim · Base Building · Strategy

Manor Lords
Shared: Strategy · Base Building · Simulation

This War of Mine
Shared: Strategy · Base Building · Survival

Kingdoms and Castles
Shared: Colony Sim · Resource Management · Simulation

Space Haven
Shared: Colony Sim · Base Building · Strategy

Frostpunk 2
Shared: Strategy · Resource Management · Simulation

Banished
Shared: Colony Sim · Strategy · Simulation

IXION
Shared: Strategy · Colony Sim · Resource Management

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

Factorio
Shared: Base Building · Resource Management · Strategy

Empires of the Undergrowth
Shared: Base Building · Strategy · Simulation

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

Captain of Industry
Shared: Base Building · Resource Management · Strategy

Ostriv
Shared: Strategy · Colony Sim · Simulation

Norland
Shared: Strategy · Base Building · Colony Sim

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

Foundation
Shared: Simulation · Strategy · Resource Management

Stranded: Alien Dawn
Shared: Base Building · Colony Sim · Strategy

Planetbase
Shared: Colony Sim · Base Building · Strategy