76%Strong matchMercury Fallen
81%24881% positive reviews, Very Positive across 248 reviews·3D · Sci-fi
—





A colony sim where you build, manage, and expand across an open galaxy. Keep NPCs occupied, or they’ll develop autonomous behaviours—leading to crime, chaos, or rebellion. Balance industrial growth with environmental preservation, enforce laws, and defend your colony from extra-terrestrial threats!
Keep Them Busy
SteamKeep Them Busy is a 2D colony simulation game that combines open galaxy exploration, adaptive NPC behaviours, and environmental management. Players must build and expand their colony while keeping NPCs occupied—because when left idle, they develop autonomous behaviours that can lead to crime, chaos, or even cult activity. Balancing industrial progress with planetary sustainability, enforcing laws, and defending against extra-terrestrial threats are all crucial to survival. Will you create a thriving, disciplined society or let your colony descend into anarchy?
• Autonomous NPC Behaviour: NPCs act independently when left idle, developing their own decisions, forming social groups, and engaging in activities that may harm the colony, like crime or illegal trading.
• Open Galaxy Exploration: Explore a procedurally generated galaxy full of diverse planets. Each planet comes with its own set of resources, environmental conditions, and challenges. Players can choose to expand their colonies to other planets or move to a new world when necessary.
• Dynamic Environmental Impact: The balance between industrial growth and environmental sustainability plays a critical role in the game. Over-industrialization leads to climate changes, pollution, and threats to NPC survival.
• Codex Ledger: Players can shape their colony’s laws and policies, making decisions that influence how the NPCs live and work. Decisions affect both the progression of the colony and the behaviour of the NPCs.
• Strategic Colony Management: Construct buildings, manage resources, and strategically place structures to optimize production while ensuring the environmental balance of your planet.
• Procedural Planets and Solar Systems: Each planet is procedurally generated, ensuring a unique experience with every playthrough. From weather conditions to available resources, no two planets are alike.
• Alien Planet Conquest and Defence: Conquer habitable alien planets and defend your home from extra-terrestrial invasions and other outer space dangers, adding an exciting layer of strategic warfare to the game
Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.
All matches
Finding similar games…
Mercury FallenShares Colony Sim · Building · Management , adds Survival81% · 248 positive reviews76%Strong match—
Oxygen Not IncludedShares Colony Sim · Building · Management , adds Base Building97% · 144k positive reviews71%Strong match—
PlanetbaseShares Colony Sim · Building · City Builder , adds Base Building80% · 9k positive reviews74%Strong match—
Space HavenShares Colony Sim · Pixel Graphics · Building , adds Base Building86% · 11k positive reviews74%Strong match—
StartopiaShares Colony Sim · City Builder · Management , adds Funny91% · 820 positive reviews74%Strong match—
One Lonely OutpostShares Colony Sim · Pixel Graphics · Building , adds Farming Sim58% · 661 positive reviews73%Strong match—All matches
The best games like Keep Them Busy are Mercury Fallen, Oxygen Not Included, Planetbase, Space Haven, and Startopia.
Match on: filter matches for Keep Them Busy by tag
Filters all matches
65%+Strong matches