Harvest Moon Friends of Mineral Town was kind of a shrunk-down version of Harvest Moon: Back to Nature that could be played on the Game Boy Advance. Harvest Moon: More Friends of Mineral Town was much the same, but an alternate version of the Japanese-only release Harvest Moon for Girl, instead.
This is essentially a version of Harvest Moon: Friends of Mineral Town that has had some of the glitches removed, some extra content added, and lets you play as a female and court the bachelors of the valley.
Rather than taking over your farm for an elderly friend who had passed away like in FoMT, MFoMT starts out with you getting bored of your life in the city and moving out to start life on a farm. Unfortunately, the land hasn't been well taken care of and it's up to you to clean it up, plant your own crops, and buy your own animals.
It's pretty standard game-play from there, buy and plant seeds you buy from the local supermarket, buy and raise animals, and find someone to marry and have a child with.
Other than playing as a girl, there were a few other new things added to the game. The only one that made a big difference was that you could now directly sell stuff to the salesman that lived on the beach, after befriending him. He could offer lower or higher prices than you could get from just shipping the item normally, so offering him a rare item could potentially get you a lot more money than normal. You can refuse his offer and try again until you get a price you like.
The other 'big' things were more superficial. The first of which was that you could now change the color of your clothes at the mirror you can buy for your house.
The second was the addition of the Farm Degree that would also make an appearance in later games. In this version, you would earn points based on what you did in-game; fishing, seeing random events in town, winning festivals... Each category had a maximum of 1000 points you could earn, but completing this didn't earn you anything special. It was more to see just how much you'd done in-game.
The last of these additions was that you could collect seven rings in game by doing different things, such as attending certain romantic festivals or by getting married. Collecting these didn't really have a point, either, it was more just for completion purposes.
I had fun with this one, and it seems to be a fan-favorite, along with its counterpart FoMT. It's relaxing, there's no real pressing plot; you're free to play at your own pace and do your own thing. The characters are memorable and fun to befriend and get to know through dialogue and events.
The only problem with this is that save batteries are starting to die on the older ones, preventing them from saving. It's not super-hard to replace the battery, but if you don't feel like dealing with that, Harvest Moon: Friends of Mineral Town and Harvest Moon: More Friends of Mineral Town are also on the WiiU eShop, if you happen to have one of those.
The game-play is fun and not too hard or too easy. The characters are nice, and you actually end up wanting to know more about them. Most of the additions might not play a huge role in the game, but they still provide a fun way to look back and see what all you've managed to accomplish.
These are popular for a reason, and I'd suggest taking a look if you get the chance.