It's the Zombie Apocalypse! But fortunately, you have your SMG ready. Move your cursor to aim, press '1', '2' or '3' to choose your weapon, hold 'r' to reload, 'space' to aim with the scorpion gun(2) only. Get a higher score to change the map and zombie!
This game was designed for problem set0 CS50. Collected the sprites from various websites. Here is the same game made by Unity game engine for the CS50 final project 2014. https://youtu.be/Z0dzcRJFeOQ