I actually ended up making another video: it was posted today. I don't think I make a lot of progress with regards to getting better, but I'm definitely learning a lot about the game.
Among the four stats available, dexterity is by far the most important, perhaps overly so. Having the ability to hit enemies (and probably dodging, though it just feels too random for me to notice) would appear to supercede practically all other considerations other than needing certain stats for skills. Strength is useful to some extent (one-hitting is what you should hope for against weak enemies), likely the second-most important skill. Endurance and Willpower, for the most part, seem to be stragglers, not providing a whole lot of what they give. Willpower's quickening of pain loss is good (as I learned in the last game in the video) but ideally you should try to avoid taking damage as much as possible anyway.
As for the skills, running seems to be worth leveling but sweep comes first for me: getting that skill to the point where using it can be done effectively without too much retaliation could very well be key against groups. Ironman, like Endurance, is pretty worthless: if it were to also give a (very very) slow regeneration of health, I'd probably get at least one point. The other skills I wouldn't know, never got to a point where I could get them. Whirlwind is sweep+ (although I bet it's got a nasty cooldown, making it less useful considering you already have multiple levels in sweep); impale and jumping are probably situational things and, again, the cooldown of abilities always seems like they can only be used in JUST the right circumstance.
I'll be taking the time to play this game some more so I can figure out what's the best way to get far (given so few options, I imagine there is a single "best"). I'm hoping that such a build (given proper tactics) will bear consistent results: even if this game is technically a roguelike, it's almost completely action-oriented (that is, extremely limited exploration and resource management) and, as such, should try to be appropriately difficult during combat.
Also, welcome to the forums!