It's Ok
It's an O.K game but, as other people have already said, 10 years? I understand it wouldn't have been 10 years of constant work on this game, but it still could have been better.
The control system wasn't great, Z and X should have been replaced by keys that are easier to reach when keeping your thumb on the space bar, ideally for me that would have been A and D.
Although not a incredibly hard game it could have been easier if you didn't get shocked by the enemies blood if you are too close when you kill them. The sound track as well was rather dull although it did fit in with the genre of the game quite well.
That said, the levels were generally well designed and detailed great, as wellt he enemies. I also really liked what ever font you used for the level headings (Level 1, Level 2, etc), what was it?
Overall, a good game but should have been better after 10 years of work.