Í allari mínari tíð sounds more like a general statement than a statement about the future (like “in all my time here, I’ve never met him” or something like that). I would personally suggest “um alla mína tíð”, “allar mínar dagar”, “alt mítt lív”, or “so leingi eg livi”.

Andafugl should be andafuglur. Faroese does not really have a vocative case.

And I personally think galdrutakrákan should be galdrakrákan. I know the English translation says chanting, but galdre- meaning magic seems to make more sense both in the context of the song and also just… as a word, in Norwegian. And in any case, it’s also a pretty awkward word in Faroese as it’s been translated here.