This game shows promise...
If you can work the bugs on this thing, and also if you can make the guns that John and his enemies use have more range, as well as making the enemies get killed instantly if you run them over with the tank. I also wish that there were more variations in between the enemies, because they all look like John and it gets ver confusing trying to find where you are. Also try to include Steve in there as a back-up, because it gets very difficult trying to take out all the enemies all at once. But anyway, I like the theme of this game and if you do some improvements it can become very successful here.