Hey, a fellow Swede! :D Gotta love the theme, and part from that the animation's great, simple but smooth - with gradient backgrounds that sometimes seem an unnaturally detailed contrast. It's all easy to follow and fun to watch, though the music... feels a bit strange. Experimental like the genre. It's uplifting music, but at the same time it really doesn't feel like anything that'd relate to 'Vikings'. I'd picture something a bit more fast-paced and ferocious, or pompous, or Norse... basically just something very different. It doesn't sound like your traditional intro music either, which maybe breaks the impression of this as an intro. It feels more like a teaser, or prelude, until that final traditional trademark splash. :)
Would love to see more Vikings, though! Nice work. And interesting read on the process behind it.
-cd-