All I have to say is wow, this game is very challenging ever at the noob level, especially if your weapons over heated after firing them for so long in which you had to wait for them to cool down. This game is very customizable with all the weapons you can choose from for each level which makes it extremely re-playable and try out different weapon combinations to survive. Of course another good thing about this game is that you don't have to be limited in the number of times you can play, so if you ship blows up you get to start over again and that is helpful when you hit a checkpoint in the game.

I would recommend this free game since it's got some good graphics, sound effects and music as well.