Littlest Catalyst: Swarm Defense screenshot 1
Littlest Catalyst Game Trailer
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Littlest Catalyst: Swarm Defense screenshot 4
Littlest Catalyst: Swarm Defense screenshot 5
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Q4 2026·LittlestGameDev·

Command a crew of tiny bots, build a modular space base, and repel relentless alien swarms. Build, upgrade, defend, and don't forget to pet the crew members.

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About Littlest Catalyst: Swarm Defense

Littlest Catalyst is a base building strategy game where you control 3-15 quirky little bots on a very important delivery mission to the center of the galaxy.

BUILD

In each level you will command your team of bots to build out a space platform with modular Tetris style walkways, expanding to essential resources.

Littlest Catalyst: Swarm Defense video 1

DEFEND

The local inhabitants are not happy about you being here. The enemies will come in waves, make sure you are ready!

Littlest Catalyst: Swarm Defense video 2

LEVEL UP

Enemies drop experience, collect enough and earn your choice of upgrade.

Littlest Catalyst: Swarm Defense video 3

SYNERGIZE

Upgrades can be applied to your crew members, your ship, your turrets, or any other structure you build. Lean hard on defenses and turtle up or opt for raw firepower or speed to get the job done. Pair upgrades from the same family for additional perks!

Littlest Catalyst: Swarm Defense video 4

BUT MOVE FAST

Enemy hives grow in size, waves grow in strength, you might not want to stay in one place for too long!

Littlest Catalyst: Swarm Defense video 5

Destroy enemy hives, Rescue lost crew members, collect jump crystals and defend your base. Balance risk and reward by sticking around to collect extra jump crystals to trade at the shop for better turret blueprints, upgrades, and items to take with you on your run.

Features:

•
A Campaign with 4 difficulty levels - where every map is procedurally generated.
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A configurable endless Sandbox mode to challenge even the most seasoned players while also welcoming newcomers.
•
Weekly challenge maps with leaderboards for those who really want to prove themselves!

Steam data © 2026 Valve Corporation. Trademarks are property of their respective owners.

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