Beat this after three years of chipping away at it and I can say it's really good but also flawed. There's a lot of typos and weird grammatical things especially towards the end (the screen you get when beating all puzzles says "pazzle"). I really hate that you can't turn off autocorrect even if you turn off all assists.
The songs are good, though I only ended up listening to two of them most of the time. I haven't gotten the chance (or motivation) to hear them outside of the context of the game, though.
I liked it and I would like to get into more themed Picross/nonogram titles if they had stuff I liked.