Unfortunately not too proficient in English so can only make out a few words of the lyrics but I can still sense the song was beautiful. I listen to songs like this all the time, I'd be able to hum the melodies but the lyrics in my head are like "belahthwakwalgoogalabala..."
This would be awesome as a final-level song as the mc is about to wake up. And, no joke, if the entire story had been good up to this point, I'd legit cry. Your playing and tone of voice were very touching.
Random but the plot reminds me of the Deep Sleep trilogy flash games. (scary af but beautiful story.)