I really wanted to 5 this. Cool style, great fight scenes, awesome concept.
This is way too hard. Unless you are very lucky with your clicks, you will never get the silver required to purchase any of the big upgrades, and without them you will never gain any kind of real ground in your searches. Expand the game, add easier difficulty levels, and add basic commands to your companions like Chisugi said.
Also, TKillVirus had a good point, that the animations get a little old. Maybe add special "critical" attacks that your characters perform for critical damage from time to time, something random but with a special animation (I have "straw hat samurai" in mind here, like with a flash of white and some heads go flying, but whatever). Perhaps have different modes, like the current mode be action mode where you choose where your points go, and maybe have an RPG mode where experience levels up your characters, and you get new characters to join you at certain levels? Maybe have a "random province generator" or "random game" option where you choose the number of provinces, starting province area size, favored enemy...
I don't know, just throwing crap out there.
All in all, I'd like to see this further polished and then thrown on steam or XBLA. You have a really cool concept here, and it could be a hell of a lot of fun. I'm eager to throw my money at you as long as I know I'm getting quality. In it's current state it's downright frustrating, and this crosses the line between getting pissed and having fun (but not that far--I'm having fun up until the point I lose 4 times in a row). I'm going to add this to my favorites. I'm hoping you do continue to polish it. Keep up the good work, and look out for us pussies who suck at games but still like to play them.