Nice little game and I would like to explain how..
Now this isn't as good as say... Matt bendo's work, but it doesn't waste time starting game, its simple to learn and fun to play with a friend for a couple/few minutes. Nice little game C=
The truth is though, I was just looking for hi quality overhead sprite for a helicopter for my new Rpg (soon itll have online feature ^^) but yeah you are doing a good job, lemme send you some sprites and people may appreciate this much better; send me a message some time?