My favorite XBLA game so far...... one of the reasons....... its FREE!!!!
The single player is ok but it is really to hard. The multiplayer is where this game is at. The multiplayer is really fun playing online co-op and it is great. You can "grab" on to other ships so that they drive and you can shoot at any direction. The driver can still shoot though. Their is usually 2 levels with about 4 or 5 different missions. Their is also about 2-3 boss battles in each mission.
The normal difficulty is pretty easy when you play with friends but challanging by yourself. The insane mode is perfect for 4 players and is really fun. The achievmens are defintly not impossible but some of them are hard. The graphics are good for a XBLA game and hey a internship program at microsoft made it.
Pros:
Its free, multiplayer, co-op
Cons:
Single Player, sound