Video review of the VK application - how best to make it? plz criticism and advice?

Question

Design

Hello!
The problem is the following: I am a designer of well-known applications VK_com
created the first ever video review of one of the applications https://www.youtube.com/watch?v=XjNh_4gwcTI
The main goal is to place it in the portfolio and show it to potential clients.
Questions:

• 1. Do I need to voice or is everything clear?
  
• 2. Switching tabs too fast or normal or slow. What is the optimal roller length?
  
• 3. Any suggestions for improvement and criticism.
  

Thanks to everyone who answers!
+100 luck

Answer 1

I would make it shorter. And at first the video is not entirely clear. Can I sign the main features on the video from above?

Answer 2

If I were you, I would ask myself a popular question among designers: “Am I doing shit?”.

Answer 3

I couldn't watch to the end without scrolling. Tired of the fact that there are repetitions. Those. here you showed how the element behaves on hover and that's enough, you don't need to show the same effects several times. It looks boring, probably because it's long and not "action". Now, if it somehow looked like this , then maybe it was possible to watch more than a minute.
And with the current presentation style, I recommend 30 seconds, well, a maximum of 1 minute.
I personally don't like music, I need something without words and rhythmic. There is still some kind of abrupt transition (1:10), it's just unpleasant to hear.