I like the syntax rules and don't need to change them, but what bugs me is that for some reason the author decided to highlight keywords with Structure group and function names with Comment (or something else). I don't like such inconsistencies. I like keywords, comments and functions highlighted with the same color in every language I work.
The problem is that I can't find the source of this syntax.
~/.vim/<after>/syntax/<filetype>vimor in aautocmd Filetype <filetype>. See the last bit of this answer. – Martin Tournoij Dec 17 '16 at 01:51