the first 8 levels i did in one sitting, no problems. then i can't get any futher i dont know how, when, or ever what i'm supposed to be doing in level nine. Even if your advice seems too obvious, anything will be helpful aside from "shoot the bad guys"

I can solve your problem!
All you have to do is keep blowing up the buildings. Try blowing up the turrets guarding the desired building first then destroy the buildings using your secondary as well as your lasers. circle around untill your shields and secondary ammo regenerate, then go back in. Repeate if necesarry. Then go on to the next obuilding take out a couple of fighters on the way. With a little praying you too can defeat it. Ha ha ha just wait untill level 14 it's a real bitch.

heh, i got to the 10th lvl in 1 sitting.

Use advanced secondary weapon (hold down secondary until charged) and hit buildings directly-dont count on the explosion).

Level 14 is easy-at least on EZ mode