Me and my friends have been playing this game for the last 2 days : It's great !
Sure, there are many problems :
Sometimes your guns don't shoot, you kill someone but the kill goes to someone else, your gun shoots on your back because of the camera (no damage, just annoying), bullet impacts on the side...
Nevertheless, we had lots of fun ! The best NG game I've played up until now, I think you can make something amazing from that.
You should definitely keep working on it ^^
Edit : Also, I randomly got Top 4 Worldwide, which is pretty sick :D