This is such a sweet story! The artwork is beautiful and the music is really soothing. I played all three endings, and my favorite is the one where Marina chooses both Delphine and Cora. I felt as heartbroken as Marina when thinking about either one of them having to leave, so the version where everyone is happy is the best.
One thing I'm very curious about is Marina's mom. We were never shown her wife, which makes me wonder if she's single. But it seems like all mermaids have to get married at a certain age. And if everyone in the queendom is female, how are the mermaids born? I think it would be cool to have a sequel or something that explains more about their world.