I appreciate the detailed reply! I ended up playing the GBC version on my DS Lite using an emulator. Other than an initial hiccup with configuring the emulator to actually write save files, it ran just fine.
I love the aesthetic of the game, with the light blue palette, pixel art, and the chiptune music. The puzzles are a decent difficulty, and the fact that they don't have timers makes the whole thing very laid back. The fish theme is cool, and you two clearly had a lot of fun with it, especially the zany descriptions.
The only time I got stuck was when I couldn't find the developer house because I thought the signpost was referring to the museum building when saying "North: ???", and I didn't think to look behind it.
Anyway, I finished the game with all 202 puzzles. Thanks for creating the game and sharing it with us!! :)