Thanks, the color scheme used in Light Theme screenshots is "Clouds" from https://github.com/filmgirl/TextMate-Themes/
Yes thank you for your feedback! For the color of the label text, I need to find a balance to maintain good readability.
Especially that color can display differently depending on screen.
EDIT : I just committed a change to the Dark Theme Green, it's better now? (screenshots are not updated for now)
This is a very good idea, I look at it soon.
When you say solid tabs, you mean like the Light Theme Blue?