Why just waste time playing video games when you could simultaneously be deleting random files off your computer? It's an unasked question that's been answered by Zach Gage and his game Lose/Lose, a top-down shooter that generates aliens based on files in your computer; files that are permanently deleted when said aliens are killed.
As you can see for yourself, it's a wonderful idea, but it's a shame our title suggestion wasn't used: "Play It In The Library." Pity.
[Thanks to everyone who sent this in!]