Contra with 3D graphics and dual-stick control.
As a nod to the Konami classics, you normally move side to side, but occasionally use a view where you're aiming up at something, usually a boss. The exploration elements usually consist of shooting at walls and searching for keycards; not exactly cutting-edge, but not terrible.
The story, meanwhile, is so shallow that I can describe it in eight words. "Clones revolt, mutate, man sent to destroy them."
Overall, not too bad, except for the fact you can only save after the (fairly long) levels. I got it for 5 bucks, and it's definitely worth that price, but not a lot more.