Thank you so much! Exactly, it is a harmonic minor scale. I added it again in the last and penultimate measure, but unfortunately, it doesn’t stand out as much due to mixing reasons. As for the ostinato, I completely agree. Instead of a marimba, I considered adding a kalimba, which has a sweeter and more delicate sound, but I eventually discarded that idea. Thank you very much for your comments! 👌🎵