Well, if this is your first movie, gratz, you made a good start!
Your artwork seems to be good, it's a bit hard to say since there are (almost) no graphics but the beast itself. But the creature is drawn just fine, so I guess I spot some talent there :-)
The music fits, and what I like most of all is the message your movie has. Btw, my inner beast try to stop me from writing this, so I just knocked it out cold ;-)
My only problem is that the movie runs a bit laggy on my PC, and the whole animation is a bit slow-paced all in all, but I give you 4/5 points, and 8/10 stars, I hope to see some more movies of you soon!