From a graphical point of view, we are in the presence of one of the finest games of the console! Level BlazBlue Continuum Shift Extend. So yes, it is 2D, but it is fine, colorful and fluid ... and the level design to die for! In short it is beautiful, very beautiful! It is better a nice 2D ultra mastered a 3D aliased to the bone and rammouille to the slightest touch.
The gameplay may seem straight forward at first (to attack, there's only one button) but in the end with the management of swords, food and health, the gameplay is much more subtle than n ' it seems! More importantly, it is very pleasant to play, see addictive!
The life is more than correct: 2 stories / characters each with a new game + ... will require a lot of hours to get around, especially to finish it 100%!
Side scenario, there are two different, rather interesting, though badly diluted, but in the end it does not affect the enjoyment of the game.
Attention, the game is not released in France (and still not expected), the game is entirely in English (but if it comes out in France, it may not be translated into English and stay as Persona 4, or BlazBlue Disgaea).
In the end, we are in the presence of an excellent game for the Vita, and it would be a shame to deprive yourself!
Edit 23/08: Muramasa Rebirth has been confirmed in Europe ... but will not be distributed but only boxed via PSN (as Ragnarok Odyssey) and may therefore very likely to be translated (like Ragnarok Odyssey).