That was one beautiful piece of art.
I like the recording at the start, but I'm just curious; where did you record that? It sounds like some sort of hallway next to a machine room, somehow. It does sound great as an introduction to the smoother pads etcetera, although I don't really understand how these machine sounds fit in with the story behind the song. Nonetheless, it works.
I really appreciate your recording work here, you've nicely laid out the sounds in the stereo spectrum, and at some points even in another dimension-I got the feeling there were sounds behind me at times. Excellent re-verb work as well, it shows that you've spent time getting those effects set up properly, to achieve the right depth to your sounds. Either that, or you've actually recorded those in a space with that kind of re-verb qualities.
Anyway, the song gives of quite a peaceful feeling throughout the first 5 minutes, the person dying is lying at peace in a bed. Then at 5 minutes into the song, the theme darkens in a scary way. Everything works smoothly, yet somehow, everything gets dark, things pitch down, more raw sounding synthesizers come in (I hear a faint little saw in there), and it gives an overall scary, doomed feeling. You know the end is near.
Then the more bass-y sounds make way for a couple of lighter synthesizers, to indicate that the suffering is pretty much over, we can be at peace again, on the other side of the door. We've walked into the light, and all is, however quite sad, okay.
Here's where the breathing doesn't make too much sense to me, since the person has passed away, they shouldn't be breathing. Then again, it may be one sitting by the deathbed, who has felt what just happened, and is now breathing heavily partly in relief, for the now deceased person is no longer suffering; and partly in sadness, for they are no longer with them.
That about rounds it up. This is not quite a piece I'd like listening to when going to bad, given the story behind it. It does manage to inflict emotions in the listener very well, and I suppose they are the emotions you intended to inflict as well. That makes it a succeeded mission. Great job.