I must say, a nice recap of what the game is all about.
But if I may give some techical pointers?
- It sounds like you're reading from a script, line by line. Try making it sound more fluid.
- If you are speaking of a certain topic, show it in the footage. (I.e. about the items, show some items)
- Try to show something actively instead of walking around for most of the time, short cuts keep the player more focussed on your video.
Dark Souls is not a hard game though. It's (as you said) all about backstabbing and finding the right way of attacking. I.E. kicking the shield first, then strong strike etc.
Personally I prefer my drake sword + thief combi. Massive backstabbing damage along with heavy armor (I have the Havel Ring so equip load is no problem for me

)
All in all, good review, just work those pointers in and it will improve even further.
I work at a gaming site as video editor, so I know a thing or two about keeping people's attention