roboblitz is well worth a download on XBLA. I just bought the full game it is great fun.
What kinda games it?
it is like a puzzle/fighting game. it is based on the unreal3 engine so the gfx and physics are great.
you are a robot in a spaceship that come under attack and you have to do lots of puzzles to get the ships defence systems up and running while you are fighting off the invaders. lots of fun weapons and games.
I got bored real quick, and put GoW back in :D