Not bad, not fantastic...
This was pretty fun, but I think you can tweak a few things to make it great. The control seemed a bit awkward. I think the best thing you can do to fix this is to make it so you can move and fire at the same time. I loved the voice acting, but good lord.....by the second level I was getting sick of hearing the guy shouting. Maybe you should make his outbursts just a little less frequent. Lastly, and other people have said this as well, but it was hard to tell where I needed to be in order to actually hit the enemy. I wasn't sure of my range, or if I was lined up correctly. You've got a good thing going, just polish it a bit, and maybe add a few more options like boosts for your character or something. Keep up the good work.