Cannon Defender -defend castle

This game's goal is to defend castle from zombie by cannon.
Here is mountain which is surrounded with darkness.
Today is horrorible night and zombie may come out.
Really zombie come out walking or running.
Must avoid zombie or fight with zombie.
Now, let's touch cannons.
There are 4 cannons up and down the cannon.
Shoot the zombie by touching cannons fast.
Let defend castle with cannons and fight with zombies.
Success! Fight with zombie! Success to defend with cannons!
Compare your score with other's in global leaderboard.