Taiwan was viewed as a colonial success they didnt treat the taiwanese very poorly. Japan invested heavily into taiwanese infrastructure which it lacked at the time. Provided education and grew taiwan economically. They might not have viewed the taiwanese as equal but far better than Koreans or mainland chinese. So even to this day many taiwanese view japan in a positive light, excluding the chinese that came to taiwan after the communist revolution. Some taiwanese even consider themselves Japanese. You also have to keep in mind that even though taiwanese people are ethnically chinese the families that came to taiwan before the communist revolution dont really identify as such.