There are different kinds of enemies each with their own attack style pattern. The most basic enemy, a star just comes at you in a linear path, so they’re usually easy to dispatch. There is a diamond shape one that does about the same only that they spawn in groups. There is a green square cowardly one that will stay away from whatever direction you’re shooting in, will try to go around you to tag (kill) you. There is a pink one that when you kill will spawn two smaller enemies that will go kamikaze for you in a circular pattern. You have a snake one (I call them sperm) that you can only kill by shooting the head off. There is a black hole enemy that eats other enemies and also draws you in via gravity, but the best attack is also has is spitting out really fast seeker enemies when it ate until it burst.