This song is absolutely stunning. You're able to build a tenderness that is soft yet incredibly powerful. The vocal performances are hauntingly beautiful and the whole song feels like a spiritual service taking place during the apocalypse. I really love the tension that builds and releases, starting from a nice piano melody until eventually it all crescendos together with organs and what sounds like a choir of angels in a desperate plea for help to heal the world. To put it simply, this was great and i am incredibly jealous of your talent :P
My only minor nitpick would be from about 4:00 - 5:30 the mix sounds a little "crunchy" in parts with a bit of distortion like the levels are clipping a bit. Just a nitpick though, i think the overall mix is great. especially the vocals and background vocals sit nice with together. With that being said i think you did great work on this one, keep it up!