Enemies s hitboxes were designed slightly bigger than the player, the purpose is challenge player to parry first, close the gap and hit after. The dash is useful once you got the trick. You can kill all bosses with no damage using the dash. ( parry, hit and run) If you tried to hit twice or more, you definitely getting hit while dashing out.
Blood particles was in the OG game. I didnt add it cuz I m new to Godot and not knowing how to use the particle effect. I will try implementing it later.
Glad you like it. Love to see your samurai game in the future! :D