So you've just created an awesome color font (it could be based on images or vectors) but the output text looks like pixel artwork?
No worries, in most case you can simply switch the Antialiasing Setting to Smooth in the Character panel.
If it still doesn't work, maybe you have hit the glyph size limit - based on the original size of the bitmap images used to create your OpenType-SVG font. It is recommended to use an original glyph size of 500 to 1000 pixels.
PS: the gorgeous lettering artwork above was designed by Ilona Repkina.