Alien Invasion is a strategy game in which the player fights aliens ship. This is a first-person shooter game, which is a battlefield full of aliens.
There are lots of .py files,
alien.py, alien_ivansion.py, bullet.py, button.py, game_functions.py, game_stats.py, scoreborad.py, setting.py, ship.py (ship.png and alien.png are also required for game).
Just Run alien_ivansion.py file to play a game.
Make sure you have to download all the required modules.