Single-player games like Littlest Catalyst
Below are 8 single-player Steam games similar to Littlest Catalyst, 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 Littlest Catalyst page.
Ranked picks
- 1
Rebellion Corporation
Single-player alternative to Littlest Catalyst — playable solo, no multiplayer required. Shares Strategy with Littlest Catalyst.
On planets occupied by robots, mine resources and escape while fending off their attacks! The Ark's survival is entirely in your hands. Many elite crews with abilities will assist you in your mission. The various turret modules are always doing their best to defend your base without your attention.
- 2
Throneguard: Last Stand
Single-player alternative to Littlest Catalyst — playable solo, no multiplayer required. Shares Strategy with Littlest Catalyst.
Become the last guardian of the kingdom and defend the throne! Fight on the front lines with your sword, build barricades and towers between waves, and upgrade your hero. Throneguard: Last Stand is a 3D medieval action tower defense game.
- 3
Calyx
Single-player alternative to Littlest Catalyst — playable solo, no multiplayer required. Shares Strategy with Littlest Catalyst.
A strategy game with a new kind of enemy, Calyx puts you in charge of a space mining outpost, locked in battle against powerful plant-aliens. Build your base, gather resources, assemble your forces, and take on the Calyx. With only an out-of-date AI for company, can you survive?
- 4
Cosmic Robots
Single-player alternative to Littlest Catalyst — playable solo, no multiplayer required. Shares Strategy with Littlest Catalyst.
Defend your planet from waves of robot invaders! Build powerful turrets, upgrade your defenses, and command robot units to fight drones, tanks, and massive bosses. Then send your own forces to attack the enemy planet in this action-packed sci-fi tower defense game.
- 5
AeonFall
Single-player alternative to Littlest Catalyst — playable solo, no multiplayer required. Shares Strategy with Littlest Catalyst.
Endless waves of 100,000 infected pour toward you. A brutally hard roguelike defense built on the Paradox of Progress: every advance raises the noise, and louder noise draws a deadlier swarm. Design your base, break through with one unit you control, and adapt each run. Survive a planet alone.
- 6
Orbital Strike
Single-player alternative to Littlest Catalyst — playable solo, no multiplayer required. Shares Strategy with Littlest Catalyst.
A real-time strategy game of orbital warfare. Build satellites, launch them into chosen orbits, and fight for control of the sky. Your assets stay invisible until an enemy sensor finds them. Every strike depends on being overhead at the right moment.
- 7
Negative Energy
Single-player alternative to Littlest Catalyst — playable solo, no multiplayer required. Shares Strategy with Littlest Catalyst.
Negative Energy is a tower defense game with basic RTS mechanics, where your goal is to defend the construction of a Dyson sphere, while fighting against waves of hundreds of enemies ships.
- 8
Iron Marines Invasion
Single-player alternative to Littlest Catalyst — playable solo, no multiplayer required. Shares Strategy with Littlest Catalyst.
Prepare to take off, soldier! The galaxy needs your strategy! Prove your RTS expertise, explore an entire galaxy and defend it from a threatening invasion.