Great list Aelius, thanks.
The only thing that bugs me is how Deadly Reflex is conceived. The effect is great, the idea is fantastic, but it destroys the balance of the game. The user chooses the % of decapitation, and to me that's pretty lame. It's like "hey, if you find the game too easy, just adjust the difficulty slider". I don't want to choose how easy or how hard the game is.
I would've liked it better as a sort of "fatality" thing. The effect is nice if, sometimes, you decapitate helpless enemies that you've already defeated or if the NPCs can also do that to you. Granted, this last possibility would be tricky, but fun nonetheless. As it is, it simply breaks the game to me (and I'm playing with OOO because I consider Vanilla way too easy and ill conceived).
Now, maybe there's a chance to turn decapitation (and cutting in half too) into some sort of "final move" and I haven't noticed, in that case, please enlighten me.

I also consider the power "enemies explode" as a big game-breaker. The timed block and the horse combat, however, are excellent. Kudos to Skycaptain.