This is an rpg from the point of view of Shade, a fellow with one hell of a checkered past who is.. in some ways, trying to find his way. It's hard not to delve into it without spoilers, but:

Very solid turn based combat, mecha style using preset moves and AP (action points) and MP (move points)
Four parts of a mech; both arms, chest, and head. Losing one disables stuff and attacks associated with it. Losing the chest loses the match.

Extrapolate that to a movie like set of cutscenes and twists and fully realized characters. The voice acting is top notch as well, and it should be high on your list of games to pick up. 100% worth full price, and a hidden gem among indies.