The concept is deep. Makes me wonder whether you've had any experience with terminal illness. IMHO, there are a few things that keep this amazing piece from being truly epic. 1- The speed. There are times when I feel as if this lags a bit. 2- The music. It's good no doubt in certain places. But I feel as if it's missed its mark emotionally speaking. The music needed more emotional depth. On a personal level, I wish the monster at the end could have looked less like a blob.
On the other hand, what I love about this is the small nuances in movement of the girl. And also the watery secondary movement of the creature/illness. It's what takes this animation to a higher level.
I am intrigued by your gallery and hope you make it really big someday. I also hope you didn't mind my critique. X