Looks interesting. Which GUI library are you using?

The UI looks quite good but I think some adjustment is still needed:

• Having a period in buttons and labels look a bit strange
• Capitalization of button labels is inconsistent
• Abbreviations like "docs" and "dir" are usually avoided in UIs
• How are directories inputted? There should be a button that opens directory selector dialog.
• Border radius should be the same in all elements (inputs, buttons and output).
• Arrow in "Project backend" dropdown looks broken.
• Overall the layout and spacing is not consistent: especially spacing between the buttons is too small and elements in the bottom are not aligned with the rest of the UI.

Note that these are just some visual things I noticed and it's hard to comment on the functionality or user experience without actually using the software.