Level 1-20 Enemy Weakness [You do more damage when you hit this part] :
1) Small Planes - Nothing. Later on, they will have machine guns, that's where the lightning canon comes in handy. They come in swarms but the lightning canon does chain damage and 1 shot kills.
2) Small Helicopters - Nothing
3) Balloons from bottom - Top balloon
4) 3-Balloon-Aircraft - Either of the 3 balloons
5) Bombers - Hit the nose of the plane and it dies in 1 hit
6) Hot Air Balloons - Hit the top
7) Huge Shield Ship - Sniper's the best choice.. Hit the back of it or just hit the yellow spot. Continue attacking with the machine gun after that
Note : You don't upgrade your towers.. They level up after killing the enemy.. Exp is evened out among the other cannons..
1) Start off with 1 machine gun.. (At the bottom)
2) Once you have enough money, buy a sniping canon to shoot off the harder enemies.
3) Buy another sniping canon and use it to tank of the enemies attacks.. [Constantly repair your weapons throughout the game]
4) The machine gun should do the job. As it levels up, it does more and more damage, making it your primary weapon.
5) Save up for either Lightning Canon/Health Buff (I suggest Lightning Canon first)
6) Once you're level 12-15, you should have the lightning canon as well as enough money to buy the health buffer and damage buffer. At level 15, you'll be given 2 extra slots.
I suggest this alignment :
- Health Buffer most top
- Damage Buffer
- [From left to right] Lightning canon, Machine Gun, Sniping Canon.
[Use lightning canon only when there are tons of mobs or when your machine gun is dying]