Good job
I think this little movie contained a pretty nice use of colour, especially in the first few screens. I also thought the beast running was quite well animated. I suppose you used a film of a striding horse as an example for that? It kinda looked like you traced such images in order to animate it. Can't blame you because I know it's very hard to get that right.
I do think the animation and drawings could use some "polishing" and smoothening, but for the rest I have to say that your first project looks quite promising. I hope you'll make some more animations for Newgrounds in the future and make attempts to improve your work.
Overall 7 out of 10, 3 out of 5. Good job in my opinion. I'm sure this will be a pass.
~Auz