Touch Arcade: To coin a phrase from a popular comedian, what is the deal with the characters in these running games? Why are they running? What's the rush? You know, you could've snagged that coin tucked away behind that pillar back there if you would've just eased on up to it. The terrified spaceman you play in Worm Run [$0.99] has a valid excuse. He's on the move, and needs to stay that way, because a giant worm is plunging after him, devouring everything in its path. Glance back and you'll see him, eating his way through stone and dirt and steel.