Slayaway Camp is a puzzle game about massacring hapless teenagers, and, perhaps fittingly, it comes from a place of aggression. “After a decade [of] making gems go clink and pegs go… Peggle at PopCap,” said Jason Kapalka, one of the founders of PopCap, and now returning to independence with Blue Wizard, “I had a lot of pent-up aggression and wanted to work on something really violent and gross.” A sliding puzzle game isn’t the most likely candidate to vent such vicious desires. And that’s entirely the point—Kapalka is looking to assault the sparkly, saccharine game genre with Slayaway Camp in action. As…