Hi there.
Just watched a bunch of your videos and I noticed a couple of things I would do differently.
First, in
this video you stopped the commentary at around 3:30, and you put some music over the gameplay. I would've watched the rest of the video if you increased the gameplay volume instead.
Second, in
this video you have an overlay with your Twitter and Subscribe, but you didn't make it a clickable link. It would be nice to click over that text and going straight to your Twitter profile (I won't search your handle on Twitter).
Third, why don't you get an overlay for all your videos?
The intro is nice and short, and I didn't see an outro... You could make something to keep your viewers from wandering off to other youtuber's videos. Just make some endcard (it's so easy to make, you can even do it using PowerPoint), and insert a little bit of an already uploaded video (you have to make it clickable though...) it might not seem very important, but trust me, it keeps people watching your videos back-to-back).
By the way, you really seem like a nice guy, and I might even subscribe to you... I don't know if this will help you in any way, but I hope so. Keep up the good work!