I’ve seen this repeated a bunch of times but it seems to be an opinion predominantly held by Brits who played Terranigma growing up. I don’t understand it, as I played Illusion of Gaia growing up and love the game dearly (and have replayed it many times since then) but I’ve played Terranigma multiple times and lost interest not long after passing Bloody Mary. The game has gorgeous music and graphics (especially the two world map themes and the early areas) but the story didn’t engage me like IoG.