Semi-serious suggestion: OCD Mode, instead of a new enemy ship appearing after you defeat one, you have to defeat the entire fleet of ships (a set amount of ships on screen) before a new fleet of ships appear. I don't know why, really, but the idea of a new one popping up as soon as I kill another is annoying, to the point of unbearable, for me. I just want to get rid of them all :D
 "Save the Earth! - The Incremental -"){kind=icon}