One cannot help but be impressed by the Angry Birds phenomenon. There are few other apps that have been so downloaded to so many mobile devices and other platforms the world over. Quite the achievement for the once relatively unknown Finnish development house Rovio Entertainment, who has developed the initially wacky idea of a war between birds and pigs into an all-conquering, money-raking force of doom. The appeal of the Angry Birds franchise is easy to identify, as it takes no time at all for casual gamers to adapt to the simplest of concepts: knocking structures over by catapulting little…