Hi Joshua,
I'm very glad that you took part in this contest, even dispite the language barrier!
And, I like your video very much.
A lot of positives, some already said, I can add to them that I like the cartoony style, how you play with the facual animation and for example that the dough you used for the arm binding is visual, all that wonderfully adds to the cartoonishness and unrealness, simultaneously giving it a sense of life. An aspect that I would count out myself is the theme of your video. A simple idea of the self being torn apart, wonderfully done justice with this monster school story that feels like it would have a whole universe behind it. Also, despite me not listening to that type of music that much, with your video it was still a very enjoyable experience!
Now to come to some critique, what I would say is that, maybe because of it's music video nature, it all is a little bit rushed. To understand it on a thematic level, I had to watch it several times. Although the little message in the end sums it up quite well, it is a different experience once you read it. Still something quite minor. Also, the arm cutting sequence made me a bit uncomfortable, but that is more due to own taste then a fault of your film .
As for a rating, I would give this a 8/10.