Killing Enemies for Android
As your soldiers march ever-forward, enemies will approach from the top of the screen. You'll need to tap one of your recruits to have them shoot your aggressors, or tap and hold for sustained fire.
The entire point of Killing Enemiesis to see how long you can last. Keep blasting those baddies without letting any reach your soldiers and you'll start to rack-up some real points. If so much as one soldier, helicopter, tank, or whatever else gets through, you're toast.