I gave it another try, XY-Controls are more comfortable for me, thanks.
I made it!!! I killed his dragon fellow and the final attack was done automatically.
I listened a bit closer to the music and even it sounds quite freestyle, it was not annoying when running through the level, it’s a good background track, not disturbing, bringing some mysterious atmosphere. For bossfights the music could become more stressful to indicate the importance of the situation.