I saw the contour of the line and treated it as kind of a rhythmic and tonal cascade. Hopefully didn't throw you off too much!
Hm... perhaps marking it with legato or pseudo markings would make that a bit more clear. When I see that, I have the mindset of making as big a change to highlight the difference.
Do you have chromesthesia? If so, then fine. But if not, I stand with robin, at least in initial claims. The subjectivity of colors is so dependent on past and present and even mood so to actually have colors be present in your mind would require such an outside force guiding you.