Neat little management game. The combat was surprisingly difficult and balanced. I feel like it would be nice to know how many samurai you have without going to battle, like when you are looking at buying them. It would also be cool if they differed in some other way, like number of hits they can take as opposed to simply different attack patterns, if you expand it maybe you can do that. Different weapons + different armors to create many samurai variants. Armor enabling more hits, weapons enabling different attack patterns. I think some transitions would be nice and some animations could help but honestly it didn't really feel that necessary the core here is very strong. Being able to deflect arrows would be nice as an alternative to armor, or perhaps a dodge that lets you pass through arrows. One more suggestion I have is just improved readability, it was hard for me to tell where an arrow might hit me.
The music and sound was pretty good too.