This is really nice. I feel like the song would be playing when everything is being destroyed or when everything is about to come to an end. The intro melody really gives a melancholy feeling like your watching everything around you fade away. The buildup to the part at around 1:05 also gives me this feeling as it could show the last people trying to figure out a way to stop everything from being destroyed. The part after that really reminds me of like a final boss fight where you have to fight this thing that's been released and stop it from potentially ending the world. The part afterwards at 2:38 could be when you've beaten it but you weren't capable of saving everything around you and your seeing the remains of what was left of this destruction. The singing could aslo be a way of showing this as you are questioning whether what you did was good and what you could have done if you had been there in time. Once again, you've done a really good job