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Early Access Release Trailer
What is Fortified Space?
Full Demo Playthrough with Developer Commentary
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Seize control of hostile planets in this nostalgic space sim and tower defense hybrid inspired by classic Flash games. Fight for orbital supremacy in starship combat, then land on the surface to build bases, deploy defenses, and shred enemies. Relax aboard your ship with farming, mining, and more.

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About Fortified Space

As Seen On

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Demo Players Recommend Fortified Space

To see what players said about the demo, visit its separate Steam page by clicking "Learn More" in the green banner above.

About the Game

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You are the captain of a Unified Earth Forces starship, leading daring combat missions deep into enemy territory.  Fight in space and on the ground as you spearhead the assault, establish vital footholds, and pave the way for Marine landing forces. Engage in ship-to-ship combat, build bases on planet surfaces, and shred enemies with turrets and your assault rifle alike.  Turn the tide in a war for humanity's survival.

Experience Intense Space Battles

Test your skills as a starship captain as you evade hostile fire, strafe alien cruisers, and escort allied ships during fleet battles.  Blast incoming missiles with your ship's point-defense turret and strike hard with your railguns.  Dominate the fight and secure victory.

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Build and Defend Planetary Fortifications

Think strategically as you deploy barriers, turrets, gates, and barbed wire on hostile planets to safeguard against relentless waves of enemies.  Or, if it's been a long day, maybe you can just build a wall of turrets.  The enemy will get the message.  Each planet has unique characteristics, but the objective is almost always the same: create a secure zone to allow our Marines to land safely.  After reinforcements arrive and you've succeeded in your mission, you can toggle Endless Mode to activate nonstop enemy attacks. Keep coming back to the planet to work on your base and fight off this relentless assault!

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Explore Your Ship - Farm, Mine, Read, and Relax

Fortified Space offers more than just adrenaline-pumping combat.  Take a break from the fight to walk around your ship, talk to your crew, and read the news articles that update after each mission.  Gather materials for your next mission through asteroid mining, hydroponic farming, and composting.  You can even kick around a soccer ball or play a target-shooting arcade game.  

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Explore Earth

Ready for shore leave?  Fly to Earth and explore the civic and cultural institutions in humanity's capital.  Don't forget to visit the Library of Earth to read about the Interplanetary War, Unified Earth Forces ships, and other interesting topics. Earth will be an area for continued growth during Early Access.

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Report to your ship and prepare for launch.

Good hunting!

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Special thanks to Richard Wei, MVP (Most Valuable Playtester)

Nightsail Game Studios logo by Alexis Paneda and Gian Paneda

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

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