I googled the story you mentioned - I found a short story about a mermaid girl? It was very beautiful, I look forward to your adaption if it.
I'm actually doing a mermaid game too! Mine's focused on a girl spending a holiday on a small island who meets a mermaid - you spend the game learning to fish & befriending the mermaid. I'll start making real posts for it when I have real content for it, haha.