I LOVED THIS, im a big fan of mermaid content since I was a child, and the beautiful pixel art and the simple yet clever gameplay made me so nostalgic of how much I loved playing flash games when they were available. I did get a little stuck on some puzzles, but somehow I was able to find the answer on my own after I posted on the puzzle help thread.
I was also fascinated by the worldbuilding and lore, as Anni said, the statues outside the castle made me wonder for quite a while, and it was a great introduction to this universe. I hope Sinny got her happy ending and was able to live freely (still not sure what was different about her, was she born with legs? or was she incapable of practicing magic? a very intriguing character, and her letters in the tower really spoke to me, I didn´t consider her perspective on the fight with her sister, and it really helped humanize her, since most of the information we know about her is from someone else´s pov.
Beautiful game, beautiful art, beautiful story and beautiful sound design! I can´t believe this was produced on such a short period of time.