The answer my friends,
I liked the style and the animation and I admire your dedication greatly. I just love every bit of it, including the music.
And for the message in the movie, I think it's about being yourself. The guy can only be himself when he's alone and when he's out in the world among other people, he's afraid they're going to judge him and make him one of them. The monsters are people who are themselves, and they try to make him realise that he can live how he wants, that he doesn't need to conform to the other and pretend to be something he's not. At the end, he realises this when the 'monsters' confront him with it. This makes him turn into a monster aswell, cause he can be himself, and now that he's a monster he can try and help other people who feel the way he felt all along.
Really isn't as hard to see as some people make it look :/
That or I'm wrong.