Nicely stylized and executed idea. On a few stages you can go off-screen, not sure if that is a know issue.
Enjoyed the little puzzles of solving the stages, although the stage with the pikemen line in the front with the archer army in the back seemed impossible with my setup. Will try to beat them later!
Also, today I learned what koku is, so that is a plus point!
Separating the fighting and the samurai management was a nice idea.
Well done!