@halohalo: Don't advertise your own games on someone else's. Don't care where else you advertise, just have some manners and don't say "Yeah I made better games visit my profile to see them" in a comment on someone else's game.
About that infinite money glitch... I added it to my profile so I don't have to respond to all the shouts. Check it there and you'll find out everything you need to know.
GIVE ME MORE BADGES! Also I found an infinite money glitch (=fun), making beating the game easy. Don't try that to get the badge though. Because you technically don't have a specific amount of money with the glitch. Ask me for details if interested in said glitch.
@SoniCanti: I have a few suggestions for your cash problems. 1) Maximize the upgrade that starts you off with more cash, then use the extra starting money for buildings.
2)Have high upgrades in building costs.
3)High upgrades in money gained from kills.
4)Anything else that raises monetary gain (especially oil well, oil well helps.) or decreases costs of things.
5)Pick one, either defeating the boss for the Huge Manatee badge (I assume that's what you meant by boss stage) or the Army of Lots badge. You're not going to get them both unless you skip that epic battle and go back later, which I can't reccomend.
@Teh13east: Its called suspension of disbelief. Everyone knows that popping a zeppelin with an AA gun is pathetically easy, but the game is clearly NOT BASED ON EARTH!
Last mission of Frozen Peaks (And I do swear by a certain combination of a damage buffer, drone maker, dual machine gun, and sniper cannon.) just use the sniper cannon on teh shield machines. Problem solved in one clean shot.
As far as upgrades go, I wish that the range bonus was the fourth upgrade not fifth like it was in defender. Also, I REALLY wish that they still looked different after each upgrade because that was pretty cool.
Okay yeah definitely get the 4 general upgrades for mages the range bonus is worth it. (This DOES NOT work for Dexers however, I got confused on this point and ended up wasting much gold.)
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I call it See Your Death. Use unicycle if you want any hope of victory.
 "Doodle Defender"){kind=icon}
 "Super Crazy Guitar Maniac Deluxe 3"){kind=icon}
 "Protector"){kind=icon}
 "Caravaneer"){kind=icon}
 "Balloon Invasion"){kind=icon}
 "StormWinds 1.5"){kind=icon}
 "The Last Stand"){kind=icon}
 "Defender"){kind=icon}
 "Grey Life"){kind=icon}
 "Anika's Odyssey"){kind=icon}
 "Free Rider 2"){kind=icon}