Letters by the Sea: Beautiful strings, reminiscent of BOTW. Dynamics were done pretty well!
Paths of Paper: Nice and bouncy, nails a sort of seaside feel. I love the bass sound and the plucked strings.
At Day's End: Ooh this one is so JRPG I love it. The instrumentation, overall feel, the chords... Really makes me want to pick up a new RPG this moment lol. This is my favorite track here.
Overall get somewhat of an Octopath influence as you said. Great work!