Don't even bother. Like All MachineWorks games (even the recent steaming pile that is Painkiller) the controls are absolute crap. It's utterly unplayable.
I've actually played a psp homebrew of this game made by someone in their bedroom that's far more playable than this port, the controls really are atrocious it's not even worth downloading for free use the space for something else.
The controls suck, but there's no reason not to pick it up for free. I've blown a few hours on it already.