Thank you for liking it. You're right—there are indeed two paths, left and right. The left path includes additional bullet attacks, so it is definitely more difficult than the right. These bullets are made up of common phrases from Chinese-style education, such as “We’re doing this for your own good,” “Why are you so disobedient?” and “Why is it only you they pick on?” They represent the cost of defying this kind of parental “love.”
As for why HP doesn’t reset, it’s because I originally designed the game with four endings in mind—three of which are determined by the accumulation of “Humanity.” To make it easier to build up Humanity quickly, I chose not to reset the game data. However, it seems that HP ended up not being reset either.