Shoot all the alien balls and upgrade your cannon!

When shoot the ball the number will decrease and destroy when it is zero.
Control your cannon to avoid the ball and fire up to destroy the balls.

How to play:
- Choose your cannons and upgrade it
- Swipe your finger to move cannon

Game Features:
- Simple but addictive gameplay
- Nice upgrade for your cannon shooter
- Difficulty level
- Friendly & cool interface