Rocket VS asteroids

Arcade video game that i made just to test my programming skills and learning more about game dev.
You control a rocket by pressing the left side of your screen to move up and releasing to go down.
Tap the right side of the screen to shoot and for every asteroid you shot will give you 5 score points.
If you fail too shoot an asteroid you lose a point.
The game is over when you hit the rocket in one of the asteroids.