It's Puyo alright. I haven't played through them all in order (never touched Sun, I should give that a shot), but it seems that by this point, they really figured out what the default difficulty should be. I will say that the super attacks seem very unbalanced (some are way more useful than others, some are pretty situational; Draco's is great for getting rid of nuisance puyo, but not very good for getting rid of your own misplaced puyos, and for many it's hard to plan around them), and there aren't very good in-game explanations for what they all do (I assume explanations would be in the manual somewhere), so their addition kind of feels like a dud. Mission mode seems to have been introduced in this one, and it's pretty decent, albeit unchallenging if you're competent with chains and just a little persistent (though Hot and Spicy difficulty get VERY tricky, e.g. "clear 4 colors at once"). While I don't dislike the art direction the series took after Fever, the old-school anime style at play here for the character portraits and cutscenes is pretty top-notch. A bit content-light otherwise, but I'm glad it got an english translation patch (shoutouts to Precise Museum).