This game is pretty sweet... It's like a twinkie made of harvest moon, with an RPG filling. Yummy.

User Rating: 9 | Rune Factory: A Fantasy Harvest Moon DS
Yeah... it's like harvest moon, but better. It with take a while to get the good monsters/house upgrades, but otherwise the time it takes to play this game runs pretty smoothly. Good, but not perfect battle system, and though the game emphasizes growing stuff in caves, you don't have to do that if you can cook and restore Rune points, and then heal with magic.
The game is good
The biggest downside that I felt was that it takes a while to get into (fully), and there is barely any in game guide. If you get the game, read the hints/cheats section of Gamespot, because some stuff that is normally dumped at your feet in other harvest moon games is a little harder to get. ( I'm talking about tools, the things that you need.)
Questions? Send me a message and I'll try to help!