"Alien Invasion" is game that functions:
- Move ship (at the bottom) in the left and right side using arrows.
- Fire from ship using spacebar
- A fleet of aliens fills the sky and moves across and down the screen.
- The player shoots and destroys the aliens. If the player shoots all the aliens, a new fleet appears that moves faster than the previous fleet.
- f any alien hits the player’s ship or reaches the bottom of the screen, the player loses a ship.
- If the player loses three ships, the game ends.
$ pip install pygame
$ cd game-directory-where-you-downloaded-this-project.
$ python alien_invasion.py