To be honest, its a very small and fun game so i think you should try to do more graphically, not that you NEED to but could make it something that appeals to more than just the GS community, dont think it'd need alot of work, few grass models, terrain shader, some free rock and tree models in the background.. and it'd be done...

i really think you could do a better job positioning the weapons, guns are the stars in a gungame.. dont just tack them on the screen because you need a gun model, is it me or you tried to rotate the model to look to the center of the screen? if so, i really dont think you need to do that if you had positioned the weapon ok..

you should atleast aim for this: