Presentation is great. The art style is reminiscent of the Metal Slug series. I really like how the visuals offer a clear indication of what is happening. Each time you hit an enemy, you'll either see an amusing death animation or see their uniforms tear. Worn down uniforms indicate that an enemy still has some fight in him, requiring a bit more attention. This is really important when faced with stronger enemies or heavy machines, like tanks.
Death animations aren't gruesome. Enemies killed with rifles and shotguns fall apart, but most of the sequences are on par with what you would see in a cartoon. Some weapons turn enemies into a pile of ashes while others spark them up, revealing their skeletons.
I was also impressed at how well the visuals scale up on an iPad. Usually, iPhone games have a pixilated look when in "2x" mode. There was still a black border around the screen, but the images were crystal clear.
Sound is sound. Gunfire and screams sound good, though there is such a cacophony of sounds going on at any one time, it is hard to notice anything in particular.