Sniper target-confusion seems a little unfair. When zombies approach from different angles the sniper sometimes dithers between targets without shooting until they knock down the tower.
Needs a suicide button! Trying to die so as to refresh the achievements takes forever. For instance, I've left the game idling to write this comment, and it sounds like he's still going strong.
 "Shattered Colony: The Survivors"){kind=icon}
 "Burrito Bison Revenge"){kind=icon}
 "Ninjas Vengeance"){kind=icon}
 "The Last Door - Chapter 1: The Letter"){kind=icon}
 "Siegius Arena"){kind=icon}
 "Caldera Legends"){kind=icon}
 "Arkandian Crusade"){kind=icon}
 "Rune Hunt"){kind=icon}
 "Level Up!"){kind=icon}
 "Pixelvader"){kind=icon}