I played through to the first boss. I wasn't totally captivated enough to keep on playing, but I did enjoy myself--I just have stuff I'd rather do.
I think it's bullshit you have to press Up to jump. It ought to be a button, dammit. They can still have that upward slicing attack if jump were an actual button.
Oh, and Amazon sent me an email about the preorder bonus poster--which I thought was GameStop-exclusive, but hey, right on. Only trouble is, every time I submit my info, it gives me an error message and says to try again later. I'll have to email the webmaster of the Muramasa site soon if this keeps happening.