Thank you, Pill!
I chose the classic "short and sweet" philosophy instead of trying to expand extensively because I though it would end up either making the piece too repetitive or creating so much new content it would loose its essence, and of course that would break the immersion I was going for. Its length also helps with the whole "loopable" idea, which could be really well implemented in game, but it's a different matter completely when you position it in a music track.
About the instruments used... well, I tried to make the song eerie and lonely, but also melancholic, which I hope to have accomplished with Gundyr's leitmotivs being played by the music box and the glockenspiel and accompanied by the sad viola and some piano disharmony. Ah, I also played with expectations in what regards to some fragments of the song, fact you can hear listening intently to the glockenspiel.
I'm happy you liked the piece. Thank you for listening, and reading this, as well. Have a good day, mate.