Ok here we go, hope this helps..
Youtube Banner: I don't hate it, consider putting the times you post on it.
Trailer: Ok, you have a trailer! YAY! First.. Don't name it 'Trailer'. Consider, People who are new - like me - will see this.. So 'trailer' doesn't do anything for me. This is the first title they may ever see.. For my vlogging channel (Youtube.com/Losoyo) - I have 'A Channel for the Intelligent and Politically minded'.. Have something that draws people. On my gaming channel I believe I have something like 'Why you should join the Heresy'.. It gets people to want to watch. The second piece.. I can't understand a thing you are saying. The music is far to loud and I have the disability of being an American, which you know - we don't get accents..
Thumbnails and Titles: When somebody searches for videos or looks at your catalog.. They see your video and your title. Those need to work in tandem to make everything jive. They don't.. Your thumbnails seem random and don't tell a story or ask a question and your titles, for me, are not compelling. Every time you upload a video it needs to tell a story.. The title needs to make the user ask themselves a question only that video can answer so they must click..
Video Content: I can watch people play games anywhere.. Everyone uploads video Game Plays. Why do I want to watch your stuff? Why is it more compelling? What are you adding? Consider this on your videos.. You have game plays, but why should we watch them? Consider putting a theme together or increasing your personality so we can hear more of it. Your audio here sounds good..
Tagging: Your tagging is all over the place.. You need to tag as much applicable content as you can.. ON EVERY VIDEO.. EVEN THE VLOGS WHICH DONT APPEAR TO HAVE TAGS.. Consider going to youtube search or google search and seeing what the drop downs are and using those.
Channel Content: Your channel is your store front, it should show the videos you have and your best stuff.. Consider using play lists and puttng them on the front of your channel.
I hope this helps.