I liked the movie a lot, probably because I´m a sucker for anything with sibling relationships, haha. I adore Elsa and Anna and their relationship, I really do.
Though the unused songs "more than just a spare" and "life´s too short" do make me pretty intrigued about what their relationship could have been like.
Like, both sisters carry their share of hurtting inside, so it would have been... interesting to see them maybe ending up angry or even yelling at each other, if just in the heat of the moment. Not that their absolute kindness to each other in the movie with no bad word about each other ever isnt touching... but I think the other thing could´ve worked too...

I also would have liked it if there was a bit more songs though, or if the songs were more evenly scattered over the movie.