The tone is beautiful, with the added context of what you're going through (I'm sorry about your loss), this really does feel like a farewell. I can tell you were emotionally charged throughout the project, and that's a good thing.
I will say the only thing I wonder about is the attachment to the theme, I can't really grasp how it connects, I suppose the melancholic vibe does fit, but perhaps more integration with the setting?
Regardless, really nice work!!