Halo Spartan Assault is a twin stick shooter that is obviously based in the Halo universe, but it does not contain Master Chief. The game was released for Windows 8, Windows RT, and Windows Phone 8 devices.
The story follows Commander Sarah Palmer and Spartan Edward Davis as they mow down rouge covenant troops that attack the planet they are stationed on shortly after the Halo 3 ceasefire, and before the events of Halo 4.
The gameplay is simple. You have one joystick area to move your troop, and one joystick area to tell your troop where to shoot. There are also buttons to activate grenades and special abilities. The problem for me is that I have big hands, so when I am playing on my 4.7 inch screen, I am covering half the action, so it can get a bit frustrating at times.
Still for a phone game it is pretty fun, and I like it when they explore other parts of the Halo universe besides the Chief and Cortana, and it does still feel like a Halo game, but I think it would be better if I had one of those gamepad attachments.