Killer moon rabbits and more!
Game play is fairly straightforward. Shoot every thing before it shoots you. There are five different kinds of weapon power ups and four types of bombs that you can collect and use. The game is very liberal in giving out power ups, but the latter levels are all most impossible with out them. The sound and graphics are both really good for the NES, and the controls are tight and responsive.
All in all, I love this game for the pure craziness of it and the fun and engaging game play. If you haven't played Gun Nac you really should give it a try.