Alright thanks for the explanation. I found the game to be quite difficult to control. Though it was good that arrows indicated were the next wave would come from.
That's not how it works. The arrow (when holding down a button) lets you shoot out the green good dots at the center for points. When the screen is emptied of red bad dots, new bad dots get spawned (which you could call a wave) that's when the difficulty goes up.
