First Impressions:
Natsume really screwed the pooch with their last Harvest Moon puzzle game, Puzzle De Harvest Moon. It was too fast paced and complicated, coupled with having to face 3 computer opponents in single player who all seem to devote every waking moment to learning how to defeat you as if they are Harvest Moon Skynet.
They learned from their prior mistakes and completely went back to the drawing board for this game, though. You get your standard grid set up like a farm, with various crops at various levels of growth on it. You can slide these crops around at will in any direction, up down left or right. Your goal, with the help of a harvest sprite, is to grow the crops to fruition and harvest them, obviously. If you string together ready crops, you complete a chain. After a harvest sprite harvests a crop, he'll do the traditional Harvest Moon water can spin and water the growing crops around him. So your goal is to constantly keep ripe crops near him to get him to move towards growing crops that need the water.
Here's the rub: the story mode takes all of 10 minutes to complete. It's a fun 10 minutes (or rather 3 minutes of actual game time, 7 minutes of hitting A to skip wordy cutscenes). After you finish story mode, you unlock mission mode, which is your standard "Complete X puzzle in X amount of moves" game, which sadly isn't as fun as the story mode was since story mode had a sense of competition against computer AI that is devoid in missions. You get a score attack mode to try to compensate, but, again, that's you competing against yourself so you really never capture the 2-3 minutes of story mode that works.
Because of this, I can't recommend this game as more than just a little time waster you keep around because it's 16 megs and you might forget it exists and be surprised to play it for another 3 minutes a year from now. It can't keep your attention because it has nothing to offer you.