personaly i think that odin sphere is a better game,muramasa plays better but the plot is all over the place and doesn't make any sort of sense which is really disappontiing after grim grimoire and odin sphere
muramasa also only plays better because 1) your character is more agile 2) it recycles less stuff,drags the game around less 3) you never have any inventory problem,that's the only ways in which it plays better
in odin sphere you had those tasty rpg element to tide you over and in muramasa they are barely in there,you level up but you never notice any sort of improvement,you make new swords and it never matters until you hit the sword with the broken power skill (which is by the way another problem,while odin sphere wasn't a hard game,it didn't feature a "i win" button) odin sphere had 5 characters which all felt different while in muramasa the two character barely differs at all,in odin sphere you used your items which also included tricks,in muramasa you just heal when necessary
also i wish to repeat it,i really liked the cutscene's of odin sphere,i'm totaly serious i can't watch this one without getting teary eyed
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if only everytime a character died in a rpg it could be done so elegant instead of the character going all "NUOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO" *sigh*