Don't know about the wobbling, but the unevenness is how it's designed.
(The backlight leakage is all about angle of view. If that's how it looks while you're using it, you might want to put it on a stand or pad or whatever that can be used to angle it up at the back a little.)
Mine is identical. I have no concerns and it functions flawlessly. The "wobble" you see is simply a result of the key size and scissor-switch design. If you look the scissor-switch design, you will see that the key does not have support on the far edges (https://www.firstpost.com/tech/news...macbook-air-2020-macbook-pro-kuo-6938731.html).
That seems perfectly normal to me. The butterfly design is supposed to improve on the wobbling and leaking backlight, but I'd rather not have it. Enjoy your new Mac.