Thank you! I'm really happy with the how the sound filter during events turned out too. I wanted to emphasize those scenes somehow without changing the music track.
I really like working with a limited number of parts when designing puzzles. For a lot of the later quests I approached the design from the point of making something a rare resource. I then backtrack from the rare resource of the quest by adding a series of exchanges that lead up to that goal, using existing locations and materials wherever I can. I've also made sure to add alternative exchange routes to almost every quest so that there's rarely just a single correct solution.
There's a total of eight quests. Two more unlock after you finish "Artifact Acquisition" and any one other. Check them out if you haven't, they feature riddles in addition to the regular item swapping mechanics.