Thanks a lot for your feedback! With respect to the music, I see your point. There are a few tips (sound and visual) that are there to try and clue you in to the same thing. I just wanted to provide a few different ways of realising that point in case you missed one of the others, but having said that you're right that it's the only clue of that kind in the game and so perhaps it would be better to have something in its place. The second solution was actually caught by someone in playtesting, but I eventually decided to leave it in because I quite liked it. If you do make it to the end without using a certain item there's a little Easter egg in the credits!