For some reason the music wasn't playing for me. Might be a browser problem though since I'm on safari.
Great game though! I love the psychological/alternate reality concept and this game 100% delivered on it.
Edit: Check out the dev's website at https://denpa.neocities.org/fbc.html
There's a walkthrough covering the endings, and some short stories that I thought were really good. The last one is so sweet, and if you're looking for a happy, fulfilling ending to Lera and Nika's story, please go read it.