The ads are so fast and the turret so slow it's completely unplayable for me. The ads are not up long enough to even allow the turret to rotate far enough to hit the X, sometimes not even halfway there. Did you forget to multiply something by the framerate delta time, so maybe running on a faster PC makes the ads stay up less time?
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That's not my issue. I was not able to get a single one. As I said, they are literally impossible at the speed it's going at unless the X is right in front of the turret to begin with, and even when it is nearly right in front of the X, I click to shoot immediately and sometimes the shot doesn't even reach the X before the next ad pops up. The last time I played, I finally nearly hit my first ad. :( Maybe it's browser related? I might try later on different browsers.