Too easy
This was a pretty decent game. Some more weapons would be nice, as well as higher difficulties. The AI is pretty poor, the enemies will shoot each other if there is another enemy between the shooter and the target. Sometimes they will aim their guns down when their target is up. After a couple of games, I switched it to 2(me) on 6(cpu) and was still able to win easily.
I had fun though... keep it up.