This game is not original at all we see games exactly like this almost every week it seems. So that will shave off a star. Another problem is that I don't like the controls, I wish it would be the arrow keys instead of the mouse because if you go off the game screen your ship is shot to the corner which can be annoying, that will shave off 1/2 a star. Another thing is that unlike other games like this you don't have 3 lives. You need to survive on one life in a mission which is extremely hard if your playing on a hard difficulty, that will shave of an entire star. One thing I liked is the alien artillery, I thought it was a nice touch, so that will add 1/2 a star to a total of 3 stars.