It's not bad.
I think that some areas weren't so good, mainly that it seemed like a song with some animations, and not an animation with a song. I think it would have been better if you tried to make it about a single person's dying thoughts and not dying thoughts in general, as many of the images were vague enough to be interpreted to mean almost anything, the photos at the end having the only real personal touch. While the song was not awful, being a musician I can say that any competent artist can compose a piece like that in about three weeks, when an only slightly more touching classical-style piece will take months, maybe years.
The individual animations were very good. Although the mouth talking looked awkward, other than that it flowed very smoothly and all semed to connect and make sense on a level which was very hard to grasp, I had to really think about what it was all symbolic of, and I still can't get the bit with the 3d castle being on the moon as it eclipses the sun. Maybe there is no meaning except what we choose to attach to it. Far too many things are like that, and I hope that that bit was just over my head, not random.