Almost didn’t notice the css files are not named obsidian.css, which wouldn’t work with our community theme fetcher. Submitted three PRs.
Regarding GDCT and Ayu, do you want the light and dark mode to be separate themes? I don’t know how much work it would be to combine them, you can use the .theme-dark and .theme-light class on body. If we can combine them into one, it would be nice as users can automatically get the corresponding theme when they switch between light and dark.