I hadn't heard about this game at all until now. I bought it on GOG and played it. It's short (good, I don't like so long games), has a good tempo and some rare sense of humor. But I must say that this is not a masterpiece as has ben said here. It's not *so* hilarious -it's just kind of funny and surreal, and not always. And it isn't that hard. It's rather easy (and I am not an expert gamer), because the IA is not very accurate. Move from left to right, forward to backward, while shooting and you are done.
The controls, even after changing them to something more usable, are simply horrible, because the mouse can't do some things we are now used to, or does two things at once!
Another thing I don't understand is that supposed lack of saving points. I pressed F2 every time I wanted to save and it saved the game. Without that, I recognize the game would be more difficult, but I didn't need to load a game many times, it's hard to die if you keep moving and shooting.
Anyway, I spent a good time with this game, I would call it quick, original and entertaining, and will probably play it again. It's the kind of game that I usually like but that I don't think will like other people. It's good for a quick play when you are back home from work and need to kill every thing that moves. No plot, no real challenge, just fun.