Overall, professional otome games have higher-quality art, voice acting, and gameplay.
This is definitely because these games, like AMNESIA: MEMORIES, are supported by large, established corporations like Idea Factory who can afford to pay teams of professional developers to create games.
Hopefully, there will be a wide selection of English otome games in the future.
Put simply, otome game literally means “maiden game”.
It is usually in a visual novel format where choices can be made by the players.