Games like Astro Colony
Games like Astro Colony include Satisfactory, Factorio, Dyson Sphere Program, Oxygen Not Included, and Hydroneer. We matched them by the tags players give Astro Colony on Steam (Base Building, Automation, Space, Colony Sim, and Resource Management): closest matches first, and among equally close ones the better-known games.

Satisfactory
Shared: Base Building · Automation · Multiplayer

Factorio
Shared: Base Building · Automation · Resource Management

Dyson Sphere Program
Shared: Automation · Base Building · Space

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

Hydroneer
Shared: Base Building · Automation · Multiplayer

Prison Architect
Shared: Base Building · Simulation · Colony Sim

Schedule I
Shared: Simulation · Multiplayer · Automation

The Crust
Shared: Base Building · Automation · Space

Stationeers
Shared: Base Building · Automation · Colony Sim

Space Engineers
Shared: Space · Base Building · Building

ASTRONEER
Shared: Space · Multiplayer · Base Building

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

Space Haven
Shared: Base Building · Colony Sim · Space

Mindustry
Shared: Base Building · Automation · Resource Management

shapez
Shared: Base Building · Automation · Resource Management

Kingdoms and Castles
Shared: Colony Sim · Resource Management · Base Building

Planetbase
Shared: Base Building · Colony Sim · Space

IXION
Shared: Space · Base Building · Resource Management

Dwarf Fortress
Shared: Base Building · Colony Sim · Simulation

Manor Lords
Shared: Base Building · Strategy · Simulation

FOUNDRY
Shared: Base Building · Automation · Multiplayer

Against the Storm
Shared: Base Building · Simulation · Strategy

RimWorld
Shared: Base Building · Colony Sim · Strategy

Once Human
Shared: Multiplayer · Base Building · Building