Get it if you dont have it yet... It's a great KRPG, probably one of the best. I read in the first pages that somebody had problems with crashing on an ipad2. Not really an ipad2, but it works fine on my ipad mini.
I don't know about the iPad 2, this will not run on an iPod 4 though. Or a 3GS from what I understand. Runs fine on a 5th gen touch. If you're running newer hardware this is a great game to add to the collection. More of a krpg dungeon crawler. Think crimson heart meets aurum blade. Very worth checking out. The plus version gives you enough coins to upgrade your inventory and have some spare coins. Try the free version first to make sure it's compatible with your device and that you like the gameplay.