I found your secret, and the music you're using is in fact public domain, so don't fret:
https://commons.wikimedia.org/wiki/File:Erik_Satie_-_gymnopedies_-_la_1_ere._lent_et_douloureux.ogg
It's a good choice, too, and really helps shape the atmosphere of the game.
But in the game, it's hard to figure out what to do, and it's not obvious what you can interact with or even click on... I think with some polish to these game play elements would help the experience a lot. As always, I imagine with more time, you would have been able to work through these issues. Good effort overall!