I think the music was quite nice but didn't fit the game much as I think a more nostalgic music would fit better with the story.
As for the puzzles, I understood much of them (I really liked the morse code for you bipped it yourself) but had a little bit of trouble understanding the last two, I think the hints were a little difficult to understand, I had to replay the games three times and have someone else play it to finally understand the tic tac toe one, and, unfortunately, I didn't understood the last puzzle.
That said, I quite enjoyed the bittersweet story that was told through the hints and would totally play it again in some months/years.
*Comment Pact Club*