Single-player games like Null Keeper
Below are 12 single-player Steam games similar to Null Keeper, ranked by player overlap. Every pick carries Steam's Single-player category, so multiplayer-only titles or always-online games don't sneak in. imho.run pulls the category data from Steam directly — Single-player here matches what the store labels.
Want the full alternatives list (paid + free + Steam Deck + cheaper picks)? See the parent games like Null Keeper page.
Ranked picks
- 1
Insect Empires
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Simulation with Null Keeper.
Choose between 4 factions and wage war against your enemies in this real-time strategy game. Insect Empires is a cartoon style Isometric real-time strategy game about colony type insects. Choose your faction and wage war against any foe!
- 2
Wall World Strategy
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Simulation with Null Keeper.
Build and lead a colony on the surface of an endless Wall. Manage resources and your people, develop new technologies, defend against relentless zyrex attacks, and send robo-spiders on risky expeditions. Keep the colony from collapsing – in Wall World, it's easy to fall.
- 3
Corsair Cove
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Simulation with Null Keeper.
Build a sprawling pirate haven, raise a fleet to explore the high seas, and take on the Crown to keep the Age of Piracy alive! From ale to flintlock pistols, and from scallywags to swashbucklers, you’ll need to manage complex production chains and govern a rowdy crew to reign supreme over the seas!
- 4
Whiskerwood
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Simulation with Null Keeper.
Establish a home for your industrious mice under the oppressive paw of your cat overlords in this city builder featuring complex simulations, intricate production chains, and the age-old rivalry between cat and mouse.
- 5
Nova Roma
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Simulation with Null Keeper.
The glory of Rome is at your fingertips in this city-building game where you must appease the gods, enact laws, and develop complex supply chains to meet the needs of your citizens.
- 6
Cliff Empire
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Indie with Null Keeper.
After a nuclear war life on the surface became impossible. A 300m thick radioactive fog covered the Earth. We are looking for bold active people to manage the process of restoring life on Earth. Join!
- 7
Dark Moon
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Indie with Null Keeper.
Dark Moon is a survival strategy game where in order to survive you must avoid the Sun’s scorching rays and embrace the darkness. Gather resources, upgrade your mobile base, make tough moral decisions, but most importantly - don’t go into the light!
- 8
Here Comes The Swarm
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Indie with Null Keeper.
Here Comes the Swarm is a survival RTS with a pause button! Create your strategy, build, manage, and defend your settlements at your own pace. Take the fight to the hive mind and lead expeditions to deliver a deadly blow and eradicate your foes. Will you reclaim Ulora from the relentless Swarm?
- 9
Biosphere Simulator
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Indie with Null Keeper.
Biosphere Simulator is a planetary god game sandbox where you guide a dead volcanic world through billions of years of evolution. Seed life, shape ecosystems, unleash cataclysms, and watch civilizations rise from primordial microbes to spacefaring societies.
- 10
Space Planet Explorer
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Indie with Null Keeper.
One wrong jump ends the mission. Explore 76 real worlds, from Mercury to TRAPPIST-1e, built from NASA data and astronomical research. Manage scarce resources, survey distant worlds, and search for humanity's new home in a science-driven space roguelite where every run could be your last.
- 11
Cozy Airways
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Indie with Null Keeper.
Build the coziest airline in the skies. Open routes across a storybook world, decorate your lounge, look after passengers with stories of their own, and grow a tiny startup into a global airline. A warm, low-stress tycoon, flown with your co-pilot Sky.
- 12
The Rug Racket
Single-player alternative to Null Keeper — playable solo, no multiplayer required. Shares Strategy and Indie with Null Keeper.
Inherit a rundown rug-cleaning shop and master a satisfying craft. Dust, wash, rinse and revive rugs one stain at a time. Build a reputation, keep the lights on, and squirm out from under the mob family that owns your debt. Every rug's a small win, and every tribute payment says you're not free yet.