I really like it. The formatting is pleasant to the eye, and the class seems balanced enough, and offers new things while also keeping most of the OG samurai features.
My only gripe is with the subclasses (well, the subclass). "You're a samurai, but left-handed" feels a bit weak as a theme for an entire subclass, and some features seem totally random ("you are left handed, so now you can summon an invisible weasel to fight for you"). The capstone is also really weak, only one additional d6 in combat which you can only trigger if your initiative is higher than your opponent's. The main subclass feature (+2 attack, -2 AC) could very well be just a fighting style.
I'd prefer to see subclasses based on the combat stances. I think they are creative and evocative and could work really well as subclasses instead of being the "additional fighting style" they are at the moment.