Half of the time you played it were spent on walking
Speaking about the bosses, they are easy to get damaged, and you just need a little of your mind to know the strategy, but the life is surely high, and you can spent a lot of time just hitting him normally. The unique difficult boss is the Big Oni, because the last one is even easier.
The scenario is great, i can say it is art, in the Japanese-Style, but it is not the saving grace of the maps without a thing, making you walk a long way without doing a thing.
In resume, i can say that if you like Japanese-Samurai histories, Hack-and-slash and great chaotic fights, this is a great game for you.