Very Nice Concept
The game was well done over all. I did not encounter any bugs nor did I run into any problems; and I didn't even read the instructions.
I believe I have seen this concept before, but not recently. This game will probably sit on the front page for a day or two. The music was only slightly annoying after the 50th loop, however it is a longer loop than some people have used in previous games.
I found that not being able to control the horizontal motion of the turret provided an extra challenge. But unlike other reviewers, I was able to control the direction of turret fire.