When it comes to instruments, I agree that the more ergonomic and intuitive option usually lies in controllers rather than keyboards, but dual-shock support still remains elusive, and so I'm relegated to the Qwerty piano. I played a round on Beginner, finding that most puzzles were able to be "note-mashed" for lack of a better term, and so I basically disregarded the sprites advice about looking at the colors of objects nearby. Even when I did actually pay attention to this principle in "Advanced" mode, there was never an indication of what note to start on, and so I feel that if the intent was to complete each segment in order to hear the full melody, such a thing requires perfect knowledge of the game. I won't beat a dead horse talking about the janky movement, instead I'll advise that next time you simply put all your eggs in one basket.
The game is mostly a Mind motivated color-melody riddle, with a Land paint-over to ensure that the premise doesn't seem too nerdy and obscure. The Lirica-branded lily pads were circumvented both times because I found it more fun to use the momentum of the sequence to jump to the stationary pads rather than call them over to me. I think aside from that one accidental instance I would have preferred a game-on-rails that just delivered me to the next melodic puzzle, and all of the design could be focused into actually making those interesting. Otherwise, incorporate the ability to play the flute into the ability to move around; I can see a game like this being really expressive and funny (in a good way) if each note carried a gust of wind that had me soaring and rag-dolling through the air like a goat without a care.
Moving around in Goat Simulator isn't anything special, certainly not even coming close to the tactile perfection among 3d titles, but what it lacks in complexity it makes up for in freedom. The aesthetic and controls also reminded me a lot of Minnie's Melodyland and Toontown. A game about finding a melody is quite the challenge of design, which is why most music games like Rock Band just have you sight-read it instead. If you want to explore this concept, truly dig into it for the interesting and challenging puzzle that it could be.