Only average.
This game had a lot of potential, but most of it was wasted, which is a huge pity. First the good. I liked the smooth graphics, even though the flashing lights gave me a headache after a while, and the music was splendid. So far so good, right? I also enjoyed the theme of shooting at various files and the graphical representations of those files were good as well, and they blew up darn good!
Now the bad. The game is simply too dull at the default. It's very easy, in fact it's ridiculously easy. A couple difficulty levels would have made this much, much better. The lack of special objects and unique enemies also hurt the bottom line. New threats, new powers, and maybe multiple levels would have picked this up and made it into something fun.
As it stands now, this is just too simple and dull to make it fun for more than a minute or two at most.