Whats your niche, do you make funnies, or maybe you are pickier than other reviewers? So far all i know is that you play with weird controls on your keyboard, and that puts me off already. Youve got the hardware ill give you that.
Ill help you a bit, so theres already angry reviewers, thats pretty common and easy value, but to stick out we need something new, how about being super sentimental? Each review you will have to shed a couple of tears, and put emphasis on all the sad/depressing parts of the game. Now this might be hard to do in happy games, but you can edit the video to tone down the colorfulness, and make it more gray. Also this would work perfectly if you review a lot of older games, you sidetrack in every episode by drifting away in nostalgia and saying how good games used to be in the past. This will net you insecure gamers who take pride in playing old games.
Its crazy enough that it might just work.
Also you need to add your verdict/score on the game, people love scores, they live by review scores, and if its a game they like they will get upset unless they see high numbers so a 9 for an average game is something you just have to live with. Cover a wide range of different types of games, especially niche ones, give them all top scores and you will have those niche gamers subbed in no time because they will feel accepted, and they are loyal.
edit: Oh and Gravity rush btw is a very impressive game, played it on my PSvita around release (rip vita), and i was amazed.