I think this is one of the best tracks in the game. This soundtrack along with the gameplay, its such an amazing experience. I made a little remix of it on my channel as well. I honestly just couldnt get enough of it.
Since i love cats, this game is great, creative and cute, and this song is my favorite from all the worlds i've played, peaceful and relaxing. I hope the devs had fun making the game just like me and everybody ealse.
As a person who finished it twice, yes that is ABSOLUTELY one of the levels that I HATE because of literally the mechanics like fr it's so hard one of the hardest besides world 10 and 11 (imo)
Piano isn't about intelligence, you just need to try again and again until you succeed . Although it may not feel worth it for you and In that case do as you want.