You have succeeded greatly in what you set out to do. With a lack of facial expression and casual body language, the subtleties of your characters personalities are hidden and we instead rely on their actions and postures to relate, giving them a much greater impact. The classic old-time silent film atmosphere has been captured and recreated skillfully, adding to the films overall character and charm. I found myself laughing out loud on numerous occasions during the movie, which is something I'd very much doubt would have happened had your characters been the typical young adults glaring at each other over a ball.
A stellar performance.