The Spillprisen website uses the logo for the fifth Chapters Book, REDUX, throughout, so I guess that's what they're judging, which is fair.
However, I still don't think the judgement here was all sensible. I truly love Simon Poole's work for Chapters, but in 2016, Owlboy literally blew me away. Granted, that is a British composer and not a Norwegian one, but Owlboy's sheer wealth of motifs and styles, the use of real instruments throughout just catapults this, subjectively, way above the last Chapters episode. And last not least, Owlboy is even doing interactive music sections. This was all and so much more than what I had hoped for Chapters.
Owlboy did bag no less than three of the seven awards, among them Game of the Year, so I'll just shut up about that. Personally, I support to give the best art award to Owlboy and therewith Simon Stafsnes Andersen. This is practically his life's work, and it is oh so pretty. From an artistic and personal standpoint however... hey, Redux was fucking incredible, OK?
I'm kind of gleeful that Earthlock didn't get a single award. The Snowcastle Games guys have been keeping their game from GOG for three and a half months now even though they've explicitly promised a release on Kickstarter and elsewhere. Which is of course in no way a sensible criterium for withholding any awards.