Spectacular Work!
This was a very different animation than most of the content on Newgrounds, particularly because it was focused more on creating a mood than actual art or animation. However, as you've proven, this is not always a bad thing. It can actually turn out quite nicely.
Lets get this out of the way first: art and animation. The art was very simple but it was very good as well. The contrasting and always "confused" black and white lines helped create a dark and dramatic mood that fit within the theme of this movie. It wasn't the most beautiful thing to look at, but it worked for what this movie was trying to accomplish. The animation was extremely simple and very choppy, usually a bad thing. However, just with the art it worked well for the tone of the movie. So overall, art and animation were not this movie's strong points.
The strong points of this movie were everything else. The music and the way the scenes were portrayed helped create the dark and dramatic tone you were going for, which worked out fantastically. The music in particular was my favorite aspect of this movie. You managed to match the music and the scenes very nicely together. For some reason, the music reminded me of the original Batman movie, but that's not a bad thing is it? :)
Overall this was an amazingly well done movie. I think it would work as a good advertisement to your friends play.
5/5 9/10