This is a pretty fun rts/rpg lite hybrid. The controls are really basic and as simple as it is you really do have to pay attention when things get hairy. In short, you select a party of up to four classes (rogue, knight, wizard, witch, barbarian, bard, and cleric with some possibilities for doubling up classes) and fight critters by dragging a line from the character to the thing you want to fight. (Or the thing you want to buff) It's $2.99 iirc and worth it on the iPad, although I could see the iPhone being way too tiny.
I just picked this up last week and I'm enjoying it. They've had a couple updates already fixing things which is a good sign. I didn't get too far into it but it looks like it has decent replayability with all the different character types. I just stuck with the basic ones at the beginning and the Cleric was driving me nuts because she kept healing a character until you tell her otherwise. Sometimes it's hard to select a character if its behind another one but as a vanilla RTS/RPG, it's fun.
"To wield Grond, the mighty hammer of the Federal Government, is to be intoxicated with power beyond what you and I can reckon (though I figure we can ball park it pretty good with computers and maths). Need to tunnel through a mountain? Grond. Kill a mighty ogre? Grond. Hangnail? Grond. Spider? Grond (actually, that's a legit use, moreso than the rest)." - Peacedog