Horrible Experience
The game mechanics are broken and the animations are dull, simple, and sometimes stolen from other artists. The whole gaming experience is weak, and even though the concept is good, it's not exactly original.
The Controls are poor; you don't stop turning when you stop pushing the button.
The Cannon spins around the back, instead of the center.
The Cannon Balls comes out of the top of the Tank, instead of the Turret.
The Cannon Balls have a gravity field bound to the Tank, rather than the stage!
The blood pools turn around inexplicably.
The difficulty of the game is poor, and once you get Medic Kits you are close to invulnerable. Why Medic Kits for a Tank in the first place?
A lot of interface objects have a simple gradient color, which looks rubbish.
Fix the above mentioned game mechanics, and go through some tutorials on flash animation to learn how to improve your game design.