iDracula is a twin stick shooter, or maybe "twin dial" would be more appropriate. By rotating the left dial with your thumb, you're able to turn and move in that direction -- ditto for the right dial and shooting. I know, I know, it sounds insane, but it works better than it has any right to.
You play as a guy who, I guess, is Van Helsing, using an increasingly violent (and increasingly anachronistic) cache of weapons to fight off the hordes of Dracula. Later, Vlad the Impaler himself shows up and ... well, you have to shoot him until he dies too. It's dumb, but no worse than squares and triangles trying to kill each other.
As you blast the forces of darkness, you'll also collect perks which provide 1 of 4 optional upgrades, everything from an instant health refill to the ability to be invulnerable for 20 seconds before you instantly die. Yeah, it's pretty crazy. There's also a meta game that has you increasing your rank every time you take down Dracula.
The whole package is exceedingly silly, but it looks great, it's got a rocking soundtrack and we hate vampires. Also, it's $0.99 until they patch it (soon!) so you should probably just go buy it without thinking too much about it. It's a skill that will serve you well for the rest of the game.
iDracula ($0.99, Chillingo):
[Thanks to Jordan W. for recommending the game!]