The game actually seems like it was done pretty well, however it goes very slow/laggy. Mainly when there are rings on the screen! Try reducing he amount of rings on screen drastically and have individual rings give you more points. Maybe even give a bonus for streaks (20 rings in a row, double score).
I enjoy the game and I think it was put togethe really well :) However as stated by manypeople, some components of the game semannoying/not as good as they could potentially be (such as the coins, and moving forward when you attack).
This game surprised me. Props to you, first FPS I've played on kongregate. Looks like the coding was done very good aswell!
4 out of five stars from me.
I actually enjoy the game exactly how it is. I like not needing to make a choice, it's less frustrating and Really I dont need it to change, I like doing the same thing over and over and over seeing how many zombies I can kill each time. Thumbs up to the creator! 5/5
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 "Mini Commando"){kind=icon}
 "Siegius Arena"){kind=icon}
 "Puzzle Cannon"){kind=icon}
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 "Zombocalypse"){kind=icon}
Will do, I didn't know it lags so much, ill try to improve the performance a bit