I don't know why devs tend to make custom mouse cursors for games. It only makes the cursor movement sluggish, people don't really care how it looks like.
Easy way to beating the game:
Choose one of the Japanese characters, put your stat points to intellect, patriotism and art of war. Intellect maxes out at 200, the other two skills at 100. Once you maxed these, pump into Con. Reach Echigo as soon as possible, and buy a full formation of Black Samurai. With high enough intellect, patriotism and art of war, they are practically immortal. From there, just conquer everything. One Black Samurai costs 5k.