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Earth is under siege!
A mysterious and powerful alien race has come to enslave the entire galaxy, and your fleet is humanity's last hope. You must put an end to the attacks and rebuild a home for the survivors. With the invaders in hot pursuit, and the dangers of the unexplored at every turn, do you have what it takes to forge a new galaxy?

Key features:

• Team up with up to 4 players and explore the galaxy.
  
• Enjoy challenging action, smart puzzles, and deep adventure.
  
• Customize your ship with a huge selection of parts.
  
• Use physics to solve puzzles or defeat your enemies.
  
• Create your own galaxy using the built in editor.
  
• Download new galaxies from other players for endless gameplay.

Proto Defense DLC

Source Studio is pleased to announce it's first Arcade map: Proto Defense!
Proto Defense is the first online multiplayer co-op turret defense game for ProtoGalaxy. Team up with your friends to defend Earth from alien invaders in this unique turret defense experience.

Key features:

• Team up to defend Earth from alien invaders.
  
• Pick from a big selection of turrets.
  
• Reposition your turrets at any time to deal extra damage.
  
• Take down huge bosses.
  
• Compete in leaderboards for the highest score.
  
• Tackle 8 new challenging achievements.
  
• Built using the ProtoGalaxy Editor.M