It was great!
I thought this was a really good game. Great presentation, great soundtrack too.
I'd disagree with the people who say it needs a storyline, it would make it cliché and pretty crap. I just want to shoot stuff! :D
The three weapons idea was cool - good call.
My only gripe would be that the target speed was quite off. Maybe not start it so slow, and not finish so high? Start faster, but not so much of an acceleration difference.
Great game though- I'd definately play again.