Tilt Sensor Joystick Shooting

This is a shooting game in which you hold your smartphone flat and tilt it to roll one ball, while simultaneously controlling another ball with an on-screen joystick, firing bullets from the ball to continuously defeat approaching enemies.
The enemy will also shoot bullets, so if you get hit you're out in one hit.
If you run into the enemy itself, you're out.
If you hit the edge of the screen you're out.
If two balls collide with each other, you're out.
If a bullet fired by one ball hits the other ball, it's out.
The speed at which enemies move will gradually increase.
The number of enemies defeated is your score.
You cannot play this game on devices that do not have a tilt sensor.
Depending on the model and type of tilt sensor installed, the ball may not move smoothly.