Very interesting mechanics and fits well to the theme.
You already mentioned it but the ball speed being quite slow hampers the experience of the game quite a bit I feel like. For puzzle games I'd like it when the game is super responsive to my input and not get in my way when I'm thinking about the puzzles.
I would have also liked to see the columns where you need to coil your lines around have indications of what primary colors they are missing, to make it easier to plan for a solution.
I could see this being some sort of time killer phone game. Well done.