I also found the end of Adv.1 soooo very bland that it made me a bit sad.
There was the team reunion to explore (we simply got nothing on how Sigrun and Reynir reacted), the exchange between Lalli and Emil after all the craziness they had been through (seriously, Lalli lived inside Emil's head and they have nothing to say?), more info about the rash (perhaps on that diary they found with the guy in hazmat suit), the fallout on Tuuri's demise (we did get a bit of it on Adv.2, but still)...
Then someone from Finland (Jitter? I'm not sure) argued that traditional Finnish tales were a bit like that, that many times there was no big, meaningful conclusion or wrapping up the story... That helped understand Minna's reasons, but didn't solve the issue, so I set all my hopes on Adv.2. There, surely, we would get more character development and more answers...