I think the premise is cool, but it falls a little flat. I would recommend separating the sound from the bullet so it doesn't get cut short when the bullet gets destroyed before the sound finishes. If you put the fire point separate from the guns position OR make the animation for the shoot reset when you shoot it will help a lot with the shooting in the air problem. Last thing is the tank controls, I think keeping it like that is cool and different, but it also turns too fast which makes it very hard to control.