Thanks for taking your time to share your opinion!
Well, I kinda was having this issue (but it's totally because my inexperience) of sometimes the attack would hit like twice or thrice during the same animation and was dealing too much damage per hit on the enemies. My palliative solution was to increase the HP of the enemies. I was planning that you should have to hit the basics enemies (from 1st stage) with something like 5 hits and the stronger ones on the 2nd stage should take a bit longer but not much, actually they have less HP than the basic ones because they block you more efficiently.
That being said... Apparently, in the final build, this "bug" wasn't happening too often and then the fight became longer than it should.
About the block stance, maybe I should've made clearer that you actually can hold D and only then press the directional... Oopsie. Anyway, thanks again for playing and for sharing your toughts!