Superb work
I haven't seen the play, but I loved this movie. You have a great artistic style that really fit well with the mood. The dark colors and vague shapes really allow the characters and setting more versatility in the viewer's imagination.
Although I really liked the music (always have loved that song), it seemed a little off compared to the action at some points. However, it was a pretty good fit overall and worked better, I think, than adding any sound effects at all.
My favorite part was the actual murder scene itself. The use of the passing subway cars was fantastic. I don't know if this is in the movie/play or you made it up, but it's downright brilliant. Despite what most posters to Newgrounds think, we do not need to see blatant graphic violence to understand what's happening. Kudos to you.
I don't give fives very often, but you got mine.