I can't speak to it as I haven't actually played it, and it may be bad, but the idea of using FF art for a Picross style game isn't something I inherently reject so long as it's actually a good Picross game. I spent bloody hours and hours on that Tetris game for the DS that had all the Zelda/Mario/Metroid/etc themed levels, for instance, and the presence of assets and music from franchises I loved made the already-satisfying twists they did on the Tetris formula even better.
That's the point I'm making, really, in general. I'm fine with the FF franchise being used in strange and different places as an idea, it just all ends up being about execution.