Astrosmack is a clone of the Intellivision game Astrosmash.
You must pilot your spaceship to successfully shoot various targets. You will encounter colored meteors that fall vertically when entering the screen. There are also spinning bombs or spinners and also some guided missiles that occasionally appear and tend to fall diagonally toward the player's initial location or it may change directions several times before disappearing. What would a space-shooter be without alien spacecraft? Astrosmack has them but they appear later on in the gameplay.
Astrosmack is easily controlled via your keyboard but does state that it is joystick compatible on the intro screen.