A good purple is exactly what the default colorset has always lacked for me, and while I'm still salty this one doesn't have a more "pure" violet or a blue violet, I think your additions are really good!
If I had to add anything actually useful (no one cares about "good purples" lol), I think the brownscale could use a more "gray" brown. Maybe like
this? Not sure how well you could blend it but I really like browns like that.