Defend Castle - from zombie

This game's goal is to defend castle from zombie.
When zombie go to castle nearly, shoot arrow by touching screen.
If zombie arrives at castle, 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 alives at castle, kill zombie by shooting arrow at the zombie quickly.
Let's kill all the zombies then defend castle completely.
Compare your score with other's in global leaderboard.