@Thariel: 13 is fairly possible, just keep reseting until you manage to fit the cat in the bucket. If there WAS an impossible badge for beating lvl 13, I would go back and conquer it.
A tip for defeating ninja-vader: at first, he shoots 5 ninja stars at you, usualy clustered together. Then he shoots 3-5 spread. Harder to dodge. Then he shoots one star. shoot him after you dodge each. after you think you kill him, he grabs a sith-sabre. shoot him while he's on th ground.
@ developer response from WHITEBOARDWAR to dragonkid11 (best comment): then why don't we just use the dirt more rather than destroying it to make room for equipment? Then again, I suppose we use speical "ore" dirt to make anti-creeper, but thats about it. :P
here is how a beet 300K of creeper on lvl 3: i built 12 lazer cannons (over time), 4 depth seeking missle launchers (1 at first, 3 later), and 3 creeper makers (1 at first, blah blah. you get it). i used the lazers to advance, the missles to hold the position, and the makers to secure the advancing lazers.
-_- I kill men, bombers, and even a steath bomber, the "death star", and a bunch of tanks... but a JUMP BOMBER kils me?... this is what we call irony. *_*
at first i was more concerned with running low on rockets and having to have to run on back to the green zone, but when all the upgrafes were baught... it got alittle lame. :P why not make a super 5 bomb laying 10 missle shooting super sub that takes 100 hits and takes 50% health/missle or bomb (when you max out the health upgrade). dodging a missile is already too easy, so this my shake things up a bit. :3