Great work. Served neat.
I think the sibilant range could be bumped 3bd...I had trouble making the lyric in some places.
I'm not so much digging the samples. I think some real pipes in the drone...a little organic variation of air pressure on the bag...swell and wane...would be really nice. And a real flute... :^) The vibrato is regular, and it got no air and pitch approach and decline. A bit stiff and un-emotional.
And a little more ambience reminiscent of valley walls , wouldn't suck a lot.
I love this stuff. I'm an Iberian Irish Kelt cousin. Stirs me, too.
Early in the vocal, there's one spot where a high, sustained note goes a little sharp beyond comfort.
Other than that, all good to my ears and for my soul.