Feedbacks most welcome on my [TwitchViewer with embeded player]!

I just finished the TwichtViewer project. I believe I fulfilled all the requirements and even went beyond to add some nice details (like the embedded video player, dropdown filter). I also tried pretty hard to keep it simple and functional.

I hope the Javascript is not a pain to read, cause it’s quite long. I swear I did my best to write disciplined and maintainable code!

So yeah, I am waiting for your precious feedbacks.
Thank you all in advance!