Hey JazzedUp, try starting with three canons and one bunker behind them. To keep the guns from getting blown up, you have to upgrade them one at a time instead of focusing on one. There is an element of luck involved, but make sure to sell guns if they're about to be destroyed so you save a little of the money. It's easy once you get the rhythm down. Get the planetary shield thing as soon as you can or you'll get killed past the halfway mark.
For a new version/sequel I would suggest: ability to control team members, more items to buy(I had way too much lose cash and nowhere to spend it), and DOT to actually do some damage. Why waste a slot on 38-75 damage + 10 per turn when I can do 200+ direct damage?
The game is good, but battle mode is just a f'in insult to everyone who plays it. If your plan was to piss everyone off and waste their time- you win. If a challenge isn't fun, relies on luck, requires no skill, and takes like 2 hours to play through, you haven't done your job as a game developer. If I want to work, I can go to my job- games are supposed to be fun.
 "PlanetDefender"){kind=icon}
 "Doeo"){kind=icon}
 "Warlords: Call to Arms"){kind=icon}
 "Sonny"){kind=icon}
 "Kongai Launch"){kind=icon}
 "Wolf Games Apple Shooter"){kind=icon}
 "The Visitor"){kind=icon}
 "Greyhound Racer Rampage"){kind=icon}
 "Momentum Missile Mayhem 2"){kind=icon}
 "Max Mesiria Chp2 RPG"){kind=icon}
 "Micro Olympics on Mars"){kind=icon}