I am watching your most recent video right now, here is some feedback to help you out:
To my knowledge, people watch gameplay videos for two reasons: For funny moments/personality of the player and/or to figure out how to go through a level, whatever game it might be.
Now, I see this a lot when I look at gameplay videos and the players either seem to have no personality, only talking a bit
or they do the exact opposite and commentate in a totally unrealistic way.
With your video, I see the former. I see you playing a game and saying some things occasionally. Now, it is not as bad as some others, but personally I do not find your commentary interesting. To be honest (and not disrespectful), I can only see someone watching your videos if they are stuck on a level or something.
What you want to do is be constantly, to the best of your ability, having something interesting to say.
I think the focus, if you are striving for entertainment, should be
you and not the game. This is another problem I see with a lot of YouTube gamers. The volume of the game outweighs your voice quite significantly, killing any personality you may have. You should put emphasis on your voice or maybe put your game volume down.
As far as quality goes, the audio is fine (other than what I said about emphasis). I'm not sure if you can make this game (the Ninja Turtles on) take up the full YouTube player, but if you can, I would recommend it.
Also, this is something I've been trying to improve on, too, but if you are not aiming for "walkthrough gameplay" and going for entertainment, then you should cut the video length down to improve viewership.
Hope this helped
