This is one of the rare pieces that is easy on the eyes yet has a pastel rainbow. You pulled off the comfy vibe and and smooth continuity of the color anim. Good job!
you basically put your colors in a specific order on each line, then move the colors by one line for each frame.
no idea how long it took, kinda surprised when other artists can answer that question 
How did you do that pulse effect within the body?
And how long did it take you to do it completely?
Wait you mean you did all of that manually
that's some crazy dedication. Really like the beating art animation