This has a really grand sound with a lot of cool harmonic moments, like 0:50 and in the main 1:20 section. I feel adding the hurdy gurdy like you said does feel very adventure with its rustic sound, along with the swelling in other instruments that fit with the feeling of floating or being in the sky. Maybe something like fast rhythms too in the background could enhance that even more. I feel this could go well with a game like BotW that you had in mind, great work! :)