This is a really cool concept, I like it, I felt like it was a self-balancing fight so as you lost more, it became slowly easier.
A note on balancing dodging, blocking and parrying. In this game, blocking is instant, and full, and requires no stamina. So dodging just seems irrelevant. To make it more viable, it might be worth making a block take a small amount of stamina, and not fully block the hit, just diminish it by 80% or something, or make it take more stamina to block a hit than to dodge out the way of a hit, so you're rewarded with less stamina consumption for good timing.
Good game though, just could use a couple of balance tweaks.