Single-player games like Calyx
Below are 10 single-player Steam games similar to Calyx, 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 Calyx page.
Ranked picks
- 1
Here Comes The Swarm
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy and Early Access with Calyx.
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?
- 2
From Glory To Goo
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy and Early Access with Calyx.
From Glory To Goo is a Sci-Fi survival RTS set on an alien world. Serve as humanity's bulwark by establishing a colony and supporting your colonists still in orbit. But beware, for The Goo, a relentless and shape-shifting force approaches from all sides, even above and below.
- 3
ERA ONE
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy and Early Access with Calyx.
Era One is an innovative space game that combines elements of real-time strategy, base building, space survival, and tactical battles. Players can create and customize their bases from scratch, construct various types of structures and warships, manage fleets, and engage in tactical space battles.
- 4
Buggos 2
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
Conquer and destroy the dirty Humans by sending swarms of bugs to crush their home worlds. Evolve your Buggos into stronger, faster, more murderous creatures that can rip the Human defenses to shreds! No one can stop your evolutionary powers. You are the evil Buggo Hivemind!!!
- 5
Space Reign
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
An indie space-sim and strategy game featuring ship and fleet combat mixed with RTS elements. Complete contracts and Claim sectors for your faction in the near-future, where resource exploiting corporations are in a state of constant conflict over territory control.
- 6
D.O.T. Defence
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy and Early Access with Calyx.
Welcome to the frontlines! Build towers, muster armies, and conquer the map. Challenge yourself in the single-player campaign following the Chroma Wars, survive relentless waves in solo defense, or battle it out in local matches against friends and AI bots. Victory comes with the last HQ standing!
- 7
The Riftbreaker
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
The Riftbreaker is a solo or Co-op base-building, survival game with Action-RPG elements for up to 4 players. Hack & slash countless hordes of enemies. Build up your base, craft powerful weapons and research new inventions to survive.
- 8
Lessaria: Fantasy Kingdom Sim
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
Lessaria is an RTS inspired by Majesty 👑 where you guide heroes with indirect control. Play through the campaign or relax in sandbox mode as you build your magical kingdom.
- 9
Creeper World: Anniversary Edition
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
Imagine an enemy that is everywhere and moves like a giant, organic mass across the map. Imagine your base and your people surrounded by a blanket of crushing destruction from all directions. Your only hope, well what hope? Then you take the high ground and pound this enemy into oblivion.
- 10
Age of Empires: Definitive Edition
Single-player alternative to Calyx — playable solo, no multiplayer required. Shares Strategy with Calyx.
Age of Empires, the pivotal real-time strategy game that launched a 20-year legacy returns with modernized gameplay, all-new 4K visuals, 8-person multiplayer battles and a host of other new features. Welcome back to history.