Space Zap is conceptually very simple, but it is also one of the most viscerally satisfying arcade games I've played. You control a space station in the center of the screen, and have to angle a turret to defend yourself from enemy ships and their artillery. This game gets fast quick— it won't be long before your run turns into DDR, and you'll soon be slamming buttons to the point of finding callouses on your hands. Space Zap's explosions are loud and crunchy, and whenever you lose a life a magnitude 8 earthquake occurs somewhere in the world. The cabinet I played on at Galloping Ghost had all too visible burn in wherever flashing lights were prone to happen onscreen. Incredibly charming, do yourself the favor of playing it if you're ever blessed to find a machine.