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Marrowsteel

Demo available

FatCat GamesDiscovered Oct 7, 2026

About the game

Assemble every turret from parts — barrel, ammo, magazine, a second gun on the mount — and hold the last line against a biomechanical swarm hundreds strong. Swap modules mid-battle as the swarm changes. Roguelite runs, bosses, a research tree.

Original Steam description

HOLD THE LINE

Behind you — the last human cities. In front of you — a swarm that never stops.

A LIVING SWARM

Hundreds of biomechanical horrors surge forward as one living mass to tear through your defenses — so where a tower stands matters as much as how it's built. And bosses change the fight: the first one walks in under an energy dome that shields every bug around it.

MODULAR TOWERS

You can't buy the ultimate tower — you build it, module by module. Mount a heavy barrel, load armor-piercing rounds, strap a second gun to the mount. Every part changes how the tower fights, and every choice costs you somethin

FEATURES

  • Modular towers - every build is unique

  • Hundreds of enemies moving as one swarm

  • Bosses with their own mechanics

  • Roguelite runs

  • A persistent research tree that grows with the towers you play

You might enjoy Marrowsteel if you like...

Thronefall, Sir, We Have an Orc Problem, They Are Billions, Diplomacy is Not an Option.

Demo and release information

A Steam demo was found at the latest check. Confirm it is still available in your region on Steam before downloading.

Steam demo, playtest and Early Access: what is the difference?

Information & artwork: Steam · Last checked UTC