This was a beautiful experience, thanks for putting it together! I've recommended it to likeminded friends also.
Only issue I experienced (spoilers!) was that I missed the Kantele on the rocks. I was then able to outmaneuver the water daemon by jumping between the rocks and then swimming to the right of the bank while jumping, and was then unable to get the Jar of Barley from the hiidenkirnu. Went back to get myself captured by the daemon so I could restart and all was fine :)