Support for Folder Color
First, thanks for the theme. There is a lack of a good square theme for GNU/Linux distros that do not look too much like macOS, and I think probably Sevi is the best one so far.
This is not really a bug, more like a request to support Folder Color (the official project page is offline as of now).
The installer would have a -f option that instead of installing all color variants it would install just one, so the user could chose the folder color variant and it would also work with Folder Color.
For this, the theme needs to be compatible with Papirus Folders: https://github.com/PapirusDevelopmentTeam/papirus-folders/
Sevi already has 9 colors for the folders, so I guess you just need to rename and group them in the correct places inside the theme, for instance: folder-black.svg folder-blue.scg folder-brown.svg etc
And the default color are just symlinks to the stock file name (i.e. folder.svg), I think.
Regards

Thank you. Found the instruction on how to do it. I guess it's the same project you mentioned. I will look into it.