I love your instrument choice of tuba, harp(?), alongside the xylophone, with the occasional timpani hit. :) The melodic interchange between the tuba and xylophone is really fun and I like the call-response or call-echo approach. The B section feels fun and energized both times it emerges with the fast-paced melody over accompaniment. The descending chord progression adds to the spookiness/gloominess of the song. Great work and thank you for sharing!