Biology Battle, a dual stick shooter much like Geometry Wars, is one of the best live arcade games despite that it is an indie game. Don't let the 240 point, $3 price tag fool you. This game looks and plays as beautiful as any game on the market right now. In fact, I think I enjoy it more than Geometry Wars Retro Evolved, and almost as much as Geometry Wars 2, one of my favorite games.
Biology Battle has beautiful graphics and great sound. The controls are smooth. It's packed full of unique enemy types and two modes--live mode and death mode. It supports up to four players locally and online, co-op and verses, but every time I try multiplayer online, no one is on. That's fine because the single player is great. Besides, if you have extra controllers, you and your friends can rock out on the couch. There are several multiplayer games, each different, you can choose to play. The point is, if you love dual stick shooters, you must download this game from Xbox live arcade in the indie section.
The leaderboards have about 30,000 people on them. As of this article, I am fifty-seven, but I plan to beat my top score soon.