Needs a little fine-tuning.
By that I mean that the premise of the game is good, and the satirical, almost half-assed nature of the game is perfect for the likes of NG.
However, in the heaven level in particular, the low framerate of the animation made it very difficult to predict Frank's motions, making it harder than it needed to be to shoot him.
Other than that, you might want to put some more detail into the characters and background. One thing you should probably do is add some civilian characters... Because as the game stands, all I really had to do was look for the first moving object...
Another thing is that since the background is black and white, and the target is in blue, all I really had to do was find the blue... You should probably colour in the background to help stop this. (And a blue sky on the Heaven level would certainly make the shot a bit harder.)
As it stands, I don't think this game is worth more than four stars... But if my above suggestions were taken into account and acted upon, I would probably give this game a higher rating... Maybe seven or more stars.
Keep at it...