That's 9 minutes of my life I'll never get back.
It's pretty good for an amateur video however lemme rip you a new one:
Sound effects were terrible, the cinematography was terrible, the music choices was cliche, and the animation was awkward the progression of the "story" was unbelievable. It was absurd. Half the video was dedicated to showing something you could have instead just displayed in a picture. At one point I went (in reference to the device on his back) "if that's a gun, I'm going to punch someone..." and it was a gun. 2014 but still, no.
In reference to the cinematography, the whole hallway scene doesn't really lend itself to good action displays unless you're trying to do an entire slowmo 300 scene (which is basically what you did) except it didn't make it badass, it looked retarded. Why would Altair fight his descendant and other assassins anyways? Just because of "what if?" No.
In fact, I actually liked the ending part more because the animation was more fluid, but it was still extremely blocky. When you're moving around, and then you stop, your whole body doesn't stop everything. Parts of you move in other places, your body weight shifts, clothes move. The section of the dance with the camera focused on the head was good, but the legs man. It was like their whole bodies were doing the Robot, it's unnatural.
Camera angles were basic but effective in places in the dance.
Also that was way more time and words I ever want to spend critiquing someone's youtube video again.