Quite the ride. From only having read the first five Hifuu CDs, I don't have too much attachment to Merry and Renko as characters... but this game might be changing that. They're written in a way that's very fun to read, and I'd love to see an episodic series like this. The Hifuu Club seems very well-suited to this genre/medium.
Visuals are great too. Merry and Renko look so cool here... dunno what it is, but the art style fits them to a tee, and complements the tone of the story. And I loved the real-photo backgrounds (you certainly did it way better than me), as they really fit right in and added to the atmosphere. The music's real chill and well-made, befitting of the gameplay.
All the elements combined give it such a great atmosphere. It felt refreshing after so many games full of bright colors and magic battles.
My only issue is that it could've been a little more puzzle-y. All the steps for progression were just kinda lying right in front of you, and AFAIK there's no way to fail. It was fun exploring the ship, but that's all the point-and-click brought to the table for me.
In short, 'twas smooth, spooky, and super [insert boat pun here]