I know more people will be playing this soon so I wanted to post about an issue I hit that is not explained at all in-game. It was so bad that I thought the game had a bug and I quit playing for the day while I waited for support.
At a certain point, you'll have to play your flute. What is not explained is that you do this not by using the mouse and clicking on the holes, but by pressing the number keys 1, 2, 3 and 4. Can't believe this is never explained, it is not obvious at all.
I hope this helps anyone searching for a solution once the game is released more widespread!