It's hard to describe why this game is such a masterpiece. It's simple - you move around a screen and your character automatically attacks hordes of monsters. You do this by picking up a variety of power-ups and weapons you find on the map. All you need are the "A,S,W,D" keys since there's no aiming or pressing shoot. The simplicity makes it perfect. There isn't much of a story; but there is progression (as you unlock new characters and abilities overtime). The progression of your skill, unlocks and achievements are perfectly paced so that you cant help but keep coming back for more. This game is a steal for $3! Get it now!!!