Games like Ecosystem - Tropical Fish Pack
Games like Ecosystem - Tropical Fish Pack include Ecosystem, WorldBox - God Simulator, SPORE™, Timberborn, and RimWorld. We matched them by the tags players give Ecosystem - Tropical Fish Pack on Steam (Colony Sim, Automation, Simulation, God Game, and Life Sim): closest matches first, and among equally close ones the better-known games.

Ecosystem
Shared: Colony Sim · Automation · Simulation

WorldBox - God Simulator
Shared: Simulation · God Game · Colony Sim

SPORE™
Shared: Colony Sim · God Game · Simulation

Timberborn
Shared: Colony Sim · Automation · Sandbox

RimWorld
Shared: Colony Sim · Sandbox · Simulation

Oxygen Not Included
Shared: Colony Sim · Simulation · Sandbox

Banished
Shared: Colony Sim · Simulation · Strategy

Kingdoms and Castles
Shared: Colony Sim · Simulation · Sandbox

Prison Architect
Shared: Simulation · Colony Sim · Sandbox

The Universim
Shared: Colony Sim · God Game · Sandbox

Factorio
Shared: Automation · Sandbox · Strategy

Dyson Sphere Program
Shared: Automation · Simulation · Sandbox

Cities: Skylines
Shared: Simulation · Sandbox · Strategy

Planetary Life
Shared: God Game · Simulation · Sandbox

Captain of Industry
Shared: Automation · Simulation · Colony Sim

Dwarf Fortress
Shared: Colony Sim · Simulation · Sandbox

Reus
Shared: God Game · Simulation · Sandbox

Autonauts
Shared: Automation · Simulation · Colony Sim

Plan B: Terraform
Shared: Automation · Colony Sim · Simulation

Cities: Skylines II
Shared: Simulation · Sandbox · Realistic

The Wandering Village
Shared: Simulation · Colony Sim · Life Sim

Planet Zoo
Shared: Simulation · Sandbox · Management

Reus 2
Shared: Colony Sim · God Game · Sandbox

The Crust
Shared: Automation · Colony Sim · Sandbox