I was pretty impressed by this. While it isn't as good as some of the later entries, it's still nice to look at. I like it how you have a certain number of enemies to kill in order to advance. It makes little sense as to why they do not have weapons at first. The music is a big plus too. It's interesting to see the different designs.
Sometimes the gun doesn't really take them out that well. I think it kind of jitters around. Whatever, it's still pretty easy to kill the enemies. It's a game where there's a lot of wide open spaces to frolick around. I just like the word "frolick".