Do you think that completing Dark Souls makes you a master of difficulty in games?
No matter how it is!
Try to go through this seemingly simple toy without saves, when one wrong move leads to replaying the entire level from the very beginning! When any touch of an enemy can be fatal, and the behavior of some flying armored goose cannot be predicted by any experience! When the music keeps speeding up, and there are still several lava flows ahead, and fireballs are flying and flying towards you, and the dragon himself (??) is jumping fervently with the desire to level you to the floor in the most literal of senses!
And you only have a couple of lives!