Halo Spartan Assault
Well, I played it and found a fairly mediocre twin-stick shooter. It plays fine with either mouse+keyboard or gamepad. It's set in the Halo universe. You move with one stick and shoot with the other. All the weapons and enemies are themed on Halo.
And that's about all there is to it.
I guess I was expecting more. It truly underwhelmed me. If you're a die-hard Halo fan who loves twin-stick shooters then this game is perfect for you. If you're anyone else you shouldn't waste your money here.