PlayDevil has reviewed Muramasa rebirth for PS Vita
Here is a snippet:
"If you're not shredding your way through your enemies you can explore the beautiful world Murumasa has to offer; finding items and secrets, talking to NPCs or discovering the endless supply of blades the game hides away, each with their own unique skills. All too often, however, the game asks you to backtrack across a great expanse needlessly. If the title didn't look as fantastic as it does it would be a serious problem. Luckily, Murumasa Rebirth is beautiful."