Nicely done, but not as customizable as some custom SCSS 
For instance, it seems there’s no way to define a color or custom shade or transparency relatively to another color (using generated HSL variables).
That’s why I would like Cwicly to generate (on demand per color, to prevent bloat) H, S, L variables and add the ability to use variables to define colors.
(See this, this and this.)
Another example: Spaces are defined with scales like fonts.
I’ve also built a few sites like this, but in the end, I’ve found out that scales don’t work well with spaces, and I prefer using multipliers applied on a medium space.
Also, there’s no way to define custom fluid variables like for instance a hero font-size which would go from text-l on mobile to text-5xl on big screens.
That said, UI is great and potential is huge!
Ability to generate classes or not per color is great, using custom prefixes for variables and classes is nice, etc.
This kind of tool should be included in all pro page builders, at least those targeting freelances or agencies.