Two major issues.
There are two major problems with this game.
1: The controls are awkward. I died more than once because of the awkwardness of the control setup (I've never been one to use the AWSD option for controls when they could be set up that way).
2: The game really wasn't terribly exciting. I got bored and turned it off after only a few waves of bad guys. There were never enough of them onscreen at a time to make it challenging, plus none of them shot at me (which could have made it challenging even with only a few enemies).
Other than that, this game has some potential. Work on those two issues and this could go someplace for you.