I really don't get it. It's just you shooting the same plane over and over. Where's the fun in that? Why is that green guy even there? You can't shoot him. I guess it might work as a time waster.
What did this even have to do with Joe Zombie? I guess that's supposed to be him shooting the gun. It seems weird for a zombie to be doing that. I'm sure the final game is much better. This was harmless.