Full confession: I'm addicted to picross. It's like my soothing game I play when nothing else is going on. Now, with the addition of Bob Ross, it's even more soothing! Art style is great here, gameplay is great (haven't tried this type of picross before, actually).
My only point of feedback is that it might be good to have a little blurb up front to explain how this version of picross works. I found the tool tip luckily, but before that I was just winging it. Anyway, this is the full package, way to go!