I haven't started on my ParserComp entry yet, as I'm working on a couple of games for the Text Adventure Literacy Jam 2022. For ParserComp, I will probably finish one of my incomplete games. The potential candidates do not have a fantasy theme. I will probably use PunyInform, so I can't incorporate any music anyway.
I plan to do a game set in feudal Japan later this year. The instruments in your two sample tunes sounded very Japanese to me. I don't want to commit to anything yet, as that game isn't even started, but I was tentatively thinking of a short theme tune at the start and a soft, non-irritating background loop of a minute or so in duration (to minimise the file size) to play during the game. Is that something you would be interested in?