So, what should I say about this game ...
This is Alien Shooter. If you haven't played any of if incartations in the past you probably don't like top-down shooters because else it's very hard to avoid this series.
Back in the days when this first installment came out it represented the pinnacle of Windows top-down shooting action games. Nowadays finally there are actual versions of games like Alien Breed from the Commodore Amiga but nonetheless this game has it's charme throwing endless waves of aliens at you, hunting down secrets in the maze-like-levels or just listening to the very good background music.
If you want a little distraction from your everyday shooter schedule and already are into this kind of games, you should absolutely give this little gem a try. But I'd recommend to wait 'til it's on discount because for the full price you could even get some installment of the former mentioned Alien Breed Series that's technically and in terms of athmosphere miles above this one here.
In fact that doesn't harm the pure and timeless no brain shooting action Alien Shooter has to offer.