Awesome, thanks for playing through to the end!
Am I understanding correctly that your advice would be to require fewer stones to enter the final encounter area, and add an additional bonus area that can be accessed if the player finds all 15?
Just a quick update on this, the new 2.0 version requires 5 fewer Skystones, to speed things up. Thank you again for your helpful insight!
For now, they have been pulled while I consider how to best add a completionist bonus . I really like your idea, so in a future release I plan to bring them back in. Speeding things up took top priority for 2.0. I played a full, regular speed playthrough after your comments and realized you were quite right, the final quest needed speeding up.