When you said text adventure, my mind clicked and I couldn't believe I forgot about this. A guy here in my home state of Utah made a program called AiDungeon.
This is artificial intelligence controlled text based adventure, and it's completely free, both online and as an app (it doesn't even have any ads!)
https://aidungeon.io/
I've had crazy amounts of fun with it, and I'd imagine that for the purpose of having a mer themed story, y'all would enjoy that as well.
Although the AI doesn't work all the time, I was actually successful in playing a few stories with different settings where I became a merboy.
Just lead the AI along carefully, start your entries off with a verb, and eventually, you can make pretty much any story you want. I played a story where I was Eric from the Little Mermaid, and instead of Ariel becoming a human and staying on land, I became a merman and joined her under the sea.
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