Galaxy is designed to be beatable at a relatively fast pace following the story. Your experience seems to pretty much line up with it. It just so happens that the remaining story worlds are not out yet.
Viewing post in Galaxy wide war is too easy?
ok, it just feels weird because I'm able to completely skip okoth territories (and thus world 14) to attack the core directly, and even then the whole (galaxy unites against you) threat feels underwhelming, as if you have a tiny line of territory between you and the rest of the galaxy, it cant attack you