Download direct :-http://linkz.it/6Wl/ca-contraevolution
Another problem is that the real estate the stick uses covers a sometimes busy part of the play area. The famous boss of the waterfall stage is more troublesome than he ought to be thanks to this, especially if you're not playing on an iPad. I've played games with a worse implementation of virtual controls, and you can learn to manage, but there's no question the original game was never intended to be played like this.
CocoaChina seems to have picked up on this, because although they've preserved the game's original stages for the most part, they've cut down considerably on the amount of bullets whizzing around and enemies popping out of nowhere.
They've also abbreviated the stages somewhat, which is very noticable in the last few stages, and cut back on the number of shots it takes to kill most of the bosses.
Contra: Evolution is a much easier game than the original, apart from the control issues. Clearing it on one credit is still quite challenging, but as there are continues you won't have to do that.