What looks strange about the colourramp is that you shift to a certain hue and then change direction. You start at 243° (at the brightest part) and shift to 236° (the saturated blue), which is a shift from a colder highlight to a warmer shadow, which is not that common but can work. Then you shift back to 312°.
Here is a little edit that has a more straight forward ramp:

This is not the way it has to be done, I just wanted to show this as an option

Also as the ramp in the edit still crosses 240° its still perceived as being warmer in the darker regions.