Demon Attack is an arcade action game where you control a laser cannon at the bottom of the screen. Your goal is to destroy wave after wave of brightly colored demons that bounce around the screen in bizarre patterns. The demons try to destroy your cannon with bombs or lasers. When you shoot a demon, it will be replaced with another or will split into two smaller demons depending on which round you are playing. As you progress through the rounds, more and more difficult demons appear.
The gameplay is similar to Phoenix , requiring quick reflexes and strategic thinking to survive the increasingly challenging waves of enemies. You must time your shots carefully to take out the demons before they destroy your cannon, all while navigating the rapidly changing battlefield.