This was a fun little game to play for awhile, I really enjoyed myself!
The bullet registration was good, the weapons are solid & I like the specials you can get too.
I will criticize the idea of charging you coins for firing the purchasable weapons; doesn't seem like a great idea to me. But seeing the comments, quite a few people have grilled you for it.
Like I said, I had fun playing this and I could see myself coming back to it now and again to kill half an hour!