Interesting implementation of the theme! It took several tries to get through the tutorial though, and I had to read the description to figure out how to play and what I was doing wrong.
Drilling holes into a flute to play them is an interesting idea, but it got a bit tedious having to drill the same holes over and over again, at least with having to let go of the drill, click the hole you just drilled, then pick up the drill again. Felt like there's too many steps you have to do. Maybe skip the extra clicks and only use the drill to play the notes?
The concept is interesting and original though, hope you find a way to make it even more fun! Oh, and the music was catchy!