Just pushed 0.0.2 and updated screenshot in OP. Lots of bug fixing and more user friendly. Right click an element multiple times to cycle through parents/children, this should make life easier if you're trying to edit a specific element. Added a button to show all modified CSS so you can just edit anything you want on the page if you know what you're doing.
I was thinking of adding some WYSIWYG to this (ex. drag and drop, colour pickers, etc.) but this may be going too far I dunno. Lets see
@Scuzz what's your workflow when theming? Are you making a child theme based off vanilla or lavender, or are you directly modifying the base theme in itself?