Nice touch adding the main theme to introduce the leitmotifs, not only is it a great piece by itself but it does help tie in everything together, like you said in the description!
"Ashore" was very fun to listen to, a true summer/beach theme!
I'm not usually a big fan of sound design focused tracks, since I normally prefer a clear melody on top of chords, but I really liked "Under Currents", maybe because the broken leitmotif usage!
This could fit perfectly in the game you described!
Great job!