Rather than dropping you into a set level right when you boot it up, Galaxies has more of a package than it's predecessor (though to be fair, it's required since it has about 40x the content). Whenever you shoot an enemy in Galaxies, they drop a small dot that, in the exact way Everyday Shooter does it, acts as the currency for the game. You use them to unlock planets and even entire galaxies. What this effectively does, and it's one of the game's main strengths, is create an almost completely open-ended game. If you don't like the next level in your current galaxy, open up another.