Just reached credits, really great time!! Possibly the best presentation I've ever seen for a nonogram game, the visuals and sound design are so so so nice and satisfying. I don't know anything about UFO 50, but as a huge Picross fan I had a great time playing this. Honestly might be the best game I've played from this year so far.
I think my one piece of feedback I'd have is probably just agreeing with those who've already commented on the hints not getting marked off as you fill them out. Even if it wasn't automatic, it would be cool if clicking on a number in the hint made it get darker to mark it off. Would help a bit, since I find myself getting lost sometimes.
Other than that though, no notes! Really great work here!