Ever since the success of Geometry Wars, the twin stick shooter has become a staple of the iPhone's game library. Many games have tried to capture the same feeling of fun and visual excitement, and even Geometry Wars itself got released with a great reception. Infinity Field is Chillingo's entry into this genre and they've pretty much hit the ball  out of the park.

The first thing you'll notice when you load up either one of the many game modes or the campaign is how tight the controls are. Weaving around the screen and narrowly avoiding enemies is a hassle free experience. In other games, there has been an issue with the player's thumbs taking up valuable screen space and obscuring incoming enemies, but in the default graphical mode (one of four available), the camera travels lower than the bottom of the game field so your thumbs aren't in the way.

The campaign itself takes you through short bursts of the game's many modes and includes boss fights, and upgrading your ship and weapons. If you'd like to see everything the game has to offer right out of the gate, the survival mode is available with such game variations as unarmed, insane mode, snake, and zombie; each putting a small gameplay spin on the initial mechanics. As you fly around and raise your multiplier, satchel drops that can be collected for upgrades and bonuses roam the field. These range from extra lives and bombs to new weapons, helpers, and even force fields and putting the game in slow motion.

Graphically the game evokes Geometry Wars with its colored shapes and over-abundance of screen warping and particle effects. Just like it's inspiration, sometimes there's so much going on that you end up running into an enemy hiding amongst the bursts of color, but it's a small price to pay for such visual flair. The electronica soundtrack will keep your adrenaline pumping, but more music would have been a nice addition.

Unless you've had your fill of twin stick shooters or the visuals of this game are too much for you, there's no reason why this wouldn't be a great addition to any iPhone gamer's library.