The first thing I'll say is that this review doesn't really do it for me - there are too little specifics - you should be able to provide the watcher with the exact specifics of length, width, blade length, weight etc. Even if you don't measure it yourself, you can go on a retailers site and get those details which will provide the watcher with the detail.
You could bring out other specifics as well - the toothpick and tweezer are not the usual 91mm Officer type, as an example.
Some rehearsals as well will pay off - there are only three 'blades' or tools, but it lacks some impetus to see you are not familiar with the knife when you weren't able to go straight to the knife. Makes the viewer think 'why should I listen to this guy, he doesn't even know his way around the tool?'.
I think a bit more of a flat and uniform background will add to the video as well, I kept looking at the gap in the wood wondering if the knife was going to slip into the nether regions!
Lastly, the recurring 'tsah' sound is a bit distracting - I know it is probably just something you naturally do as you gather you thoughts, moisten your mouth or whatever, but it is a bit plosive and does become a bit distracting.
Hopefully the criticism will be taken in good grace, I applaud anyone who is prepared to document things, but I think this needs some polish before you're going to start gaining much of following.