Fun game, but I wish the level select screen displayed something to help me figure out what level it was. At the moment, it's hard to go back and find the ones I want to replay without going through every single level.
The progression is one dimensional, and the units are extremely unbalanced. It's fun for a minute, but there's no real strategy to it, so it gets boring quick.
Interesting, and I like the high levels of customization that the game is built on... but the actual little shooter game itself is horribly boring, and too repetitive.
The weapons are unbalanced to the point of making most of them useless... and a good portion of the games content seems to require a pay service... Lame.