Very good game, I love puzzle games. But you should lower the difficulty a bit.
I no longer knew what to do in the part of the piano and the circle that changes colors appeared. Then I suddenly press Q and I have the power of wind, I don't know if it was a bug.
The part of the mine and the car also took a while, not because I didn't know what to do, just because I didn't know where the car will turn, then I understood about the levers directions.