It could have been a perfect movie, if they depart with the Oslo crew from the very first meeting, like "I'm sorry, we're different, we're designing churches here, not burning them... I'm outgrown off metal sorry"
And again, instead of a "Oslo career" branch, they're having a twisted "party" for grown-ups (relatives and parents) which leads nowhere for the story.
Also, the range of music she is listening to is quite too wide, from Dio, Priest and Maiden to Obituary, this is more like a "hey we know what 90ies were like" than a real person preferencies pattern (even an evolution).
I think this movie has some solid points, but overall lacks consistency and strong plot line. They could have done it better.