Touching lyrics, both romantic and sad at the same time, the twist is nice and creative, always nice to hear something that breaks traditional formulas without feeling forced, here it is essential part of the story.
Very creative chord progression, many unexpected turns, sometimes changing quite rapidly but that's ok because that's a good reason for a re-listening. The calming backing track supports the story well.
I would have titled the song 'At Last', because the 'letter' is not directly present, that's just how I felt the powerful lyrical image, nothing wrong with 'Love Letter' smile

Janne

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