Hey Xeros,
Some tips, that might not get more people to your channel, but will make the channel seem more professional, would be to improve you channel art (banner, avatar, thumbnails) and your channel description.
Starting with the description, you want to make sure to add links to your media, such as twitter, facebook, google+ or anything else. Also add a some more explanation of what you did in the video, maybe what the game is about, there is a lot that could be added, even if it will only be for yourself as a reference in the future to see what you did in a particular video.
The channel art will be a bit more complicated and will need more work. There are free programs such as Paint.NET or GIMP that can really help make simple but well personalised and engaging art. Do not have something that is too plain otherwise people will forget about the channel, but do not have something too complicated otherwise it will look messy. This goes for both you banner and your avatar.
The thumbnails need an upgrade, on your first video the thumbnail is really impossible to read and it has black borders which you do not want at all. On the second video the text in the bubble is difficult to read and it is ab it difficult to see the other bubble making it seem like it is the person's thought. It is a good idea, just, it can be better implemented. With the third the text is legible, but the colours are really not matching with the type of video and it looks very unprofessional, you want something that still looks the part, not just something to grab people's attention.
I hope that helps
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Best of luck!