From the developer's website, http://www.bizarrecreations.com/games/geometry_wars_galaxies/ Galaxies isn't just Retro Evolved on a new platform... There are plenty of new features, the largest of which is the new campaign mode. This area of the game is mission-based, and will see your ship flying from solar system to solar system to fight the 'orrible bad guy shape thingies. There will be new enemies, weapons, and gameplay types.