Well... I'd change the title of that one video and put (joke) at the start of it or something... you know the one
For me it was a bit cluttered, most people have a solid pattern or background colour and it helps things pop out. The subscribe button can be a bit smaller, people aren't going to miss it and it felt a bit in my face. But I'd be interested to hear what other people thought about that.
I liked you're thumbnails and think it's great how your face is on them all so people can easily spot your vids in their feed/boxes