Operation Dracula is a really good shoot-em-up. One of the best bullet hell on iOS in fact and it's full of features including MFi controller support. Everything you would want is here.
Don't believe me? Read the review of our own Count Harry and see what we though of the game here.
Today, Crescent Moon released a free version of the game that features ads in case you don't want to pay for it. It's called Operation Dracula Zero and you can find it here.