OH man this is awesome the game plays completely different from the first. Its definitely worth having both games assuming you like fist of the north star otherwise play which ever one you find better.
Seems to folow the manga, going through even the minor bad guys, zeed was in the first and now we have spade show up. There's strange omissions i.e. can't use environmental weapons, grab is now a default animation, complete removal of hyper mode.
Enemy variation seems to have upped and enemies can even now change between long range and short range weapons this makes things a lot more interesting.
Meridian system abolished and i don't like that, you have scrolls now and they seem to do all kinds of weird stuff if you rearrange them. Levelling seems to be assoicated with just killing stuff while being good at combat. Using more variety adn keeping your helath high and not getting hit while move variation you will level up everything.
I can't fairly compare this game to the first until i level up my characters.