8,840. Just to post a score... I don't get the scoring system. Seemingly randomly I get points awarded, points deducted, bullets awarded, bullets deducted. Took me a while to realize that you have to shoot the rotating flags, too.
Also, I hate this kind of shmup. I will give it a few more tries.
I'm sure you noticed, but on the left side of the screen, there will be an occasional bonus/penalty pop up. If you shoot it, then whatever it says, is what you get. Generally, it's not a good idea at all to be shooting over on that side, because more often than not, you will get an accidental penalty.
It is ALWAYS worth trying to shoot for extra bullets. Bullets are the name of this game. Shoot the ducks before they steal them, shoot the numbers moving past to get more, and be as accurate as possible.
And the flags/pipes are worth a ton in the beginning, while the screen is crowded, and they're difficult to hit. But with each gallery item eliminated, they decrease by 10 or 20 points, so hitting them as much and as early as possible is the key.