Tower defense is a genre that's almost run its course, if you ask me. But Defenders of Ardania is still a really solid tower defense title for the iPad that does find some innovation left in the process of setting up towers and letting them take out the incoming bad guys. The twist here is that while you're building towers for defense, you're also purchasing your own invading forces, which are then sent to wander out towards your enemy's castle. In other words, it's a kind of reverse tower defense, where you both attack and defend against an enemy doing the same.
Unfortunately, that makes things a little complicated -- you still have a gold pool which you refresh by killing bad guys (as usual), but you need to use th