I have been playing this for the last month or so. It actually is pretty cool.
For starters, there are no designated character classes. If you wanna be a warrior, you use a sword and a shield and focus on raising skills that benefit a warrior. If you decide that you want your warrior to, say, be able to make potions at some point, you can do so if you have enough ability points.
As it was mentioned, your character ages every saturday. If you play long enough, your character can supposedly get an age in the hundreds, but their appearance stops changing at at 25 or 26. You also stop gaining stats from leveling at 26. The only ways to continue gaining stats are to eat foods that benefit the stats you are trying to raise or shell out real money for a character card to be reborn as a 10 year old with the stats, skills and gear of what you were when you rebirthed.
Another thing is how armor works. Armor is divided into clothing, light armor and heavy armor. All armors of the same type have the same defensive bonus, just differing appearances and durability , or in otherwords, a shorts and shirt set has the same defense as a ninja suit as they are both clothing, they just look different and one is more durable than the other.
The battle system actually requires some strategy too. You HAVE to learn when is the right time to defend or counter or fall back and use a bow or magic. Just going into most fights with "slash slash slash" will get ya killed.
I'm stopping here as I most likely sound like a shill by now. Check it out at least once. There's some good stuff to be found.