Hi,
I have a little hard to figure out, what I was doing (language barrier).
I did get the feeling, that the coins were scattered more or less randomly (not completely there were some inside the temple on the hill). Maybe that should each be 'gated' by a small challenge or puzzle so they feel rewarding to find. In my opinion, it should also be rather simple to find them, nut harder to get them (but that is personal preference =)).
Consider translation in subtitles for us mere mortals who don't understand that language =)
I wish you luck in the future!