"Hmm..."
Overall it is a good game and concept. However, because the controls and aim are far from good that brought what could have been a ten down. Another problem is that if you continue shooting and moving your aim for too long consecutively, the game becomes slow to react. I ended up backed up against a wall mauled by monsters, all because the game slowed and the aim did little to help me out. Maybe it would have been better if I had chosen the dumbed down graphics, but that gets rid of one of the sole reasons I played the game in the first place. Other things you might consider are more weapons, different objectives, and larger shooting range for the guns.
I know you probably put alot of effort in it, and dont get me wrong the game is not bad, but if you are going to go this far with a game you might as well go all the way by fixing the few things wrong with it. But overall, good job.