What do you get when you cross Geometry style graphics with Tower Defense gameplay? Well geoDefense of course. That’s the best description of this game really and it’s not a slight in the least. geoDefense, from Critical Thought Games, is literally hours of fun, challenging gameplay that both looks and sounds great.

If you’re not familiar with Geometry Wars it’s a exquisitely crafted shoot-em up for the Xbox 360 that utilized cool vector graphics with eye-pleasing 3D effects and frenetic gameplay. On the other hand Tower Defense has come in a wide variety of shapes and sizes now but the premise is the same, build towers and other defenses to prevent the bad guys from getting to your base as they follow a set path. Utilize skill, strategy and the right mix of defenses to pass each level. Succeed and move on, fail and try again.

geoDefense gives you 30 levels, 10 each easy, medium and hard, to test your mettle and determine if you truly can defend against all comers. You’ll have your choice of four upgradeable towers - blaster, laser, missile and shock - with which to defend your base against multiple types of creeps including large slow one, quick moving spiky ones and several others.

There’s nothing extremely innovative in the game play as you place the towers an the screen where they best suit your needs to destroy the enemies. You do so with the tip of your finger and it works fairly well though it’s difficult to see where you are placing the tower from time-to-time. Aside from that the controls work quite well. While it doesn’t utilize the accelerometer in the iPhone, it doesn’t need to. The gameplay mechanics work well.

As I said both the sound and graphics are extremely well done. The sound is not the most robust but works extremely well in the almost minimalist feel of the vector graphics and the simplicity of the gameplay (yet hard to master of course). All around geoDefense is a winner in my book. In the price to value area this game comes out way ahead with a price of .... on the iTunes app store.