That makes a lot of sense. Since the heroine is the character we spend the most time with, her personality really sets the tone.
The love interests are important too, but they should complement her rather than overpower her.
Nice choice! I’m playing Collar×Malice right now.
Old otome games still have a special charm, and I agree that the art style can make a big difference.
I’d love to try Harukanaru Toki no Naka de Hachiyoushou someday.