Challenges
- (Easy) Change the background of the game
- (Easy) Get the hero to move up and down
- (Easy) Get 7 enemies to show up instead of 4 at a time
- (Intermediate) Get another type of enemy airplane to show up
- (Advanced) Collision Detection for the airplanes – when the hero collides with the enemy, have your score go down by 500.
- (Advanced) Collision Detection for the bullet – Have the score go up by 10 when an enemy is struck down.
- (Advanced) Get the enemy to explode when it is hit
- (Advanced) When the bullet hits, make a sound.