Hi there :)
I love the instrumentation! It fits well for an underwater theme. The theme is a bit too minor for me to imagine a shop theme though; I had expected something a bit more uplifting and casual. The current song feels more explorative to me, and for such a theme this would work wonders! The melody at the start was a bit awkward for me to get into with the weird note-rhythm, but after 0:16 it worked out great for me. The ending reverb fade-out was interesting too, in a good way! Nice song :D
Oh, and small reminder: your "link to streaming service" doesn't work as intended, as this song is not on your streaming service ;)