Motor Cycle Shooter - bullets

This game's goal is to go forward firing bullets.
Here is a motor cycle shooter,
If touch anywhere on up screen, motor cycle will move upward.
If touch anywhere on down screen, motor cycle will move downward.
During game, tank and circular saw will appear.
You must not collide with tank and circular saw.
Firing bullets is automatic.
If bullet collides with tank, score will rise.
Compare your score with other's in global leaderboard.