It was a very nice experience! Loved your art! The horn mechanics were well done. It felt like operating a complicated machine while actually being simple to understand with the notes and hints. I have spent more time than planned playing with the harmonica, trying to create other music besides the one needed, haha. So, good job with that—it was well done!
I agree with SoulSplitter's feedback on the sounds and inventory. I would also add that I would have liked more "hints" foreshadowing the final twist. Nevertheless, I liked the story you crafted.
Good work! Bravo.