It's a very good effort, I must say, and very expressive composition-wise. The way it progresses sounds more than professional and every instrument it's in exactly its place where it should be, not an extra note or less. It also paints quite vividly a canvas that is pretty much inspired by film score as far as claiming I could easily see this in a Disney Fantasia movie if it were made exclusively of Newgrounds pieces.
While there's quite a lot going on in this brilliant piece, I think your instruments could have needed some more ambiance and reverb, as to give them a soul for them to truly breathe a life of their own. Right now, while I deem the whole structure to exceed my expectations, it feels a bit stiff and dry to my ears. It might have been intentional and I'm not entirely sure, but given how much you did spend your time on this, I think it's quite a shame to not give your orchestra a huge, hall sound since you've already got a very cinematic sound.
You may even consider this as mere nitpicking if you wish, as it doesn't really detract from the experience at all and I think nobody should be concerned by the "fakeness" of the orchestra as well. This piece stands tall and it's a great soundtrack for your artwork of choice. I say great job, mate.
//FD