Defend Tower - from zombie

This game's goal is to defend tower from zombie.
When zombie and bat go to tower nearly, shoot arrow by touching screen.
If zombie arrives at tower, life will be reduced by one.
You must not shoot sheep.
If you shoot sheep, your life will be reduced by one.
If all the three lives are reduced, game will be over.
The arrow is only weapon to kill zombie.
Before zombie arrives at castle, kill zombie by shooting arrow at the zombie quickly.
Let's kill all the zombies then defend tower completely.
Compare your score with other's in global leaderboard.