Oooh that's nice! I made a nonogram game as well but never made a tutorial because of how much extra work it would be. Good job on doing the work.

My twist on the game is that it's multiplayer. I posted it on the nonogram subreddit a few years ago and to my surprise I still have a few daily players. I'd recommend posting it there as well, they're nice folks.

Here's mine. Multiplayer, free, browser-only, no ads/tracking. https://berendswennenhuis.nl/nonogram/