I'm a tad late to the party but I thought I'd add my thoughts to the pile.
As it stands right now I love the direction the devs are taking the game. There's so much potential in this and I can't wait to see more. The demo has also been rock solid stability wise for me. Though I do have few observations that I thought were worth mentioning.
Firstly the weapon weights seem odd, at least for the swords. Now i'm no swordfighter but I've held quite a few in my time and they tend to range from ~4lbs for sabers, short sword, long sword, etc to ~8lbs for larger two handed weapons. Right now it seems like they are a lot heavier and as a result their attacks are these slow swings that have the character over extending during attacks. Now I could see this being the case in something like platemail or something that limits mobility but seeing a guy in a shirt swing like that seems really odd. It's also be nice to have the character at a bit more of a ready stance. The sword and shield are a fighter's tools and they belong up in front of them, not at their sides.
Next up, the character seems to take a long time to turn around, it's the proper time for someone just casually standing there but you would expect someone in combat to be a bit more expedient.
Additionally, there's not a lot of feedback when you make contact with a soft squishy part of a person. Even something as simple as a blood stain on the ground would work. Sure, it doesn't make a ton of sense for a puddle of blood to suddenly appear but it gives some lasting visual reference for the player that they made a hit and it wasn't blocked by armor.
I also agree with one of the other posters that having a visual cue for your strike would be nice. Now given how dynamic the combat it this is understandably difficult. If it were possible to add something indicating the arc the seeing will take though would be nice even if it's just an approximation. Maybe just a transparent plane that follows the orientation of the character's strong elbow (right hand in the player's case) when they go to swing. In addition to this I would just love a 3D mouse cursor. Right now it's difficult to tell where you're telling the character to swing, and I feel like having a cursor inside the game world would make where you're swinging a lot more intuitive.
Lastly just a little bit more zoom would be nice. I read one of the other threads about looking for your opponent's tells and it's totally true. Having just a little bit more zoom would help in this regard. PLus it allows us to marvel at the game's beauty
aaaaand that's it. Everything else seems amazing and I can't wait to see the game grow. You guys are building something really unique here and I love it.