It's two months later and I never played any Golden Sun, but I am here to answer you.
My #1 favorite is 1-14, which I had on in the background and wasn't paying attention to track titles when 2:14 hit and I grinned and shouted "BACK TO THE FUTURE!" into the empty room. What a fun reference. 3-10's vibe of "Fly Me To The Moon" like from the Evangelion credits is also nice.
I liked the whole 70s jazz band vibe in 1-13, and that it seemed like the same band came back for a slower track in 2-01. Right after that, 2-02 absolutely power-bombed me with unexpected New Orleans brass band awesomeness. That's easily one of the coolest tracks I've ever listened to on this site just because it's SO different in style from the ordinary.
Also fun was a lot of general, unabashed weeb-iness in the third disc, especially 3-05 which felt like the second ending song to some 2000s anime, the 3-10 Eva callback, and the final track also having the J-pop/anime opening music feel to it. Glad I gave this one a listen even without any familiarity with the source tunes. Thanks for your hard work in pulling something fun together.