Ok, your first order of business should be to get a name for your channel that isn't already taken.
That said, I haven't seen your video yet, but I can critique your thumbnail and title.
Your thumbnail seems kind of bland. The idea of a zig-zag seperating the left and right sides of the thumbnail sounds cool in concept, but it's execution is lacking. Stay inside the lines. Keep it nice and slick. The zig-zag needs to be a clear dividing line; the black needs to be entirely on the left and the green needs to be entirely on the right.
What are those blue lines on the left side? Are they supposed to be a dragon, or are they supposed to be another font of text? If it's the latter, then I can't read it.
Try to include a face shot in your thumbnails. Perhaps a stock photo of someone smiling and jumping for joy, as that would be consistent with the theme of your videos. Try and include that on the right side while your text is on the left side of the thumbnail.
Text in a thumbnail is not an automatic no-no, but it's recommended you keep it to a minimum. The title and first few words of your description already provide text for the viewer.
You also want to use heavily contrasting colors as well as colors that go well together aesthetically. Don't let that latter requirement scare you; it's actually a lot easier than you probably think to check if a pair of colors go well together. In fact, professional artists have known the secret formula since the Renessaince Era!
Taw-daw! I present to you ... the color wheel!
Basically, colors that are opposite of each other on the color wheel will usually look good together. So red goes well with green (like Christmas), blue goes well with orange, and so on and so forth.
"Opposite" does not necessarily mean 180 degrees, but you should aim for at least 90 degrees apart from each other on the color wheel, recommended 120 degrees.
Another really easy way to know what colors look good together is to check out the sports uniforms for most professional sports teams. Those teams, and the multi-million dollar marketing firms they can afford to hire, have already done all the research for you. Case in point: The basketball team The Los Angeles Lakers wears yellow and purple in their uniforms. As you can see above, yellow and purple are opposite each other on the color wheel!
In addition to using good looking colors, your colors also need to be high contrast. That's also a lot easier than it sounds. In a nutshell, colors contrast if one is light and the other is dark. Take, for instance, the post you're reading right now: It's black text against a white background, and that contrasts really good! But doesn't have to be two different colors; it can be two different shades of the same color, as long as one is light and the other is dark! Take, for instance, this title screen of a famous video game:
https://i.ytimg.com/vi/zed9meG9fjo/maxresdefault.jpg
It's brown against brown, and yet you can still read it ... because it's dark brown text against a light brown background!
That blue stuff on the left side of your thumbnail is hard for me to read, because it's dark blue against a black (aka dark) background. You should make it higher contrast.
Now, as for your description, you should not include hashtags in your description. Write fully coherent sentences in the description. Youtube's version of the "hashtag" are called "tags" (no hash). You are allowed a maximum of 500 characters for your tags; they don't require the # sign in front of them (instead; there's a separate section in the video's metadata for tags that is separate from descriptions), and on top of all of that, using the space in your description to include more tags is actually against youtube's rules.
Instead of including hashtags, the description needs to ... well ... describe the video! Granted, the title already does 99% of the work in telling viewers what to expect, but the description can help contribute to that as well.
So that about does it for the thumbnail and description. I'll check out the video itself and then get back to you.