Meh...
It was OK. I won't grade on the reason WHY you made it (which some people find totally unacceptable for this point in time) so I will grade on the rest.
Graphics: 4; They weren't the best,and they should have been worked on (I know you made this 4 fun, but you should have made it better for NG).
Game play: 7; Very simple and easy to learn. A little too easy on the difficulty though.
Audio: 3; The only audio was the gun and the phrases. The phrases mean nothing to whoever doesn't speak the language. And they were flatly hard to hear, as they would all combine at some times. there also should have been background music.
Now, it was probably a poor choice to put this on NG; there will be people who blam you for the content, and mainly just for the fact your shooting teachers and not evil people.
Advice for you: make another version for the people who flip.
Advice for people who flip: Pretend you're shooting MJ or Britney Spears. For some reason those games are found to be acceptable.