How to Download Fortified Space

1. Click on the Fortified Space download button below.
2. Choose "Install" to install the game on the windows steam client.
3. Follow the on-screen prompts
4. Let it download the Full Version.
5. Once a game is downloaded, use the Windows Steam Client to play the game.

=== Download Game ====

Download for pc →

This guide describes how to use Steam Proton to play and run Windows games on your Linux computer. Some games may not work or may break because Steam Proton is still at a very early stage.

1. Activating Steam Proton for Linux:
Proton is integrated into the Steam Client with "Steam Play." To activate proton, go into your steam client and click on Steam in the upper right corner. Then click on settings to open a new window. From here, click on the Steam Play button at the bottom of the panel. Click "Enable Steam Play for Supported Titles."

Alternatively: Go to Steam > Settings > Steam Play and turn on the "Enable Steam Play for Supported Titles" option.

Valve has tested and fixed some Steam titles and you will now be able to play most of them. However, if you want to go further and play titles that even Valve hasn't tested, toggle the "Enable Steam Play for all titles" option.

2. Choose a version
You should use the Steam Proton version recommended by Steam: 3.7-8. This is the most stable version of Steam Proton at the moment.

3. Restart your Steam
After you have successfully activated Steam Proton, click "OK" and Steam will ask you to restart it for the changes to take effect. Restart it. Your computer will now play all of steam's whitelisted games seamlessly.

4. Launch Stardew Valley on Linux:
Before you can use Steam Proton, you must first download the Stardew Valley Windows game from Steam. When you download Stardew Valley for the first time, you will notice that the download size is slightly larger than the size of the game.
This happens because Steam will download your chosen Steam Proton version with this game as well. After the download is complete, simply click the "Play" button.

Windows Pc Requirements

Minimum:

• OS: Windows 10
  
• Processor: AMD Ryzen 7 4700U
  
• Memory: 6 GB RAM
  
• Graphics: AMD Radeon
  
• DirectX: Version 12
  
• Storage: 5 GB available space

No maximum requirements!!

Linux Requirements

No minimum requirements!!
No maximum requirements!!

Mac Requirements

No minimum requirements!!
No maximum requirements!!

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 with railguns, turrets, and shields. Then descend to the surface to build a base, deploy defenses, and shred waves of enemies.

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.

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 resupply with unlimited materials to continue building. Keep coming back to the planet to work on your base and fight off enemies!

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.  

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.

Report to your ship and prepare for departure.

Good hunting!

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

“Fortified Space offers an unique blend within the strategy genre. The game alternates between intense space battles and surface missions where the objective changes completely…this change of scenery is one of the game's most interesting ideas. [Translated from Spanish]”
Kotaku (Español)

“When one indie developer couldn’t find the sci-fi game of his dreams, he built it himself...this is one of the most promising sci-fi indies of 2025.”
Fix Gaming Channel

“The game's presentation was interesting; it has that charming sci-fi Newgrounds Flash feel, but updated in terms of broad gameplay and requiring a strategic approach to clear the objectives.”
We Playtest Games