|Never really gotten into Puyo Puyo puzzle games before; they're more or less the incredibly overpopulated falling-block genre of puzzle games, only the "Puyos" are little jelly blobs that are constantly falling from the top of the screen, one at a time. You have to get four blobs of the same color next to each other, and then they disappear, showing down badness in your opponent in the form of non-color-blob blocks that block of blob-matches. As in all games of this type, if your stack of blocks reaches the top, you lose.
The "Sun" gimmick here (I may have the name of this game slightly imprecise, I suppose) is that sometimes--not sure why--a beam of sunlight shines down on part of your blob stack, and then a sun icon drops there. I'm not quite sure what the sun does, but I'm guessing it helps in combo chains or something.
Puyo games kind of annoy me, because in order to do well, you have to be setting up combos for yourself, as far as I can tell, but the gameplay itself invites you just to take the easy single matches all the time, and I just can't get myself motivated to try setting up combo matches. So at stage two or three I start to lose badly, and then I just end up not liking the game much.
Aside from the rotating sun in the middle of the screen, there isn't a whole lot going on visually, and really the game gets pretty boring, even while I'm getting stomped.