Beating wave 30- max up the spread bullets as much as possible. Then click and release, click and release. If you are firing single bullets youve held to long. The axe thrower always goes in a pattern. take out the missile firer first then hammer thrower then the guy behind the shield. Make ample use of the EMP. Grenades will cancel the hammer throwers throw. Managed it this way without taking a single hit.
Uncheck all the download tanks boxes when you first press play and you will be able to escape easily. When you go to edit your tank you can download them then. Vote to keep this at the top.
 "Blacksmith Lab"){kind=icon}
 "Creeper World 3: Abraxis"){kind=icon}
 "The Peacekeeper"){kind=icon}
 "Fantastic Contraption"){kind=icon}
 "Papa's Wingeria"){kind=icon}
 "Bubble Tanks 3"){kind=icon}