Pixl.js Menu Font size

Hi everybody,

is there a way to enlarge the font size of the Pixl.menu() function/module? I found the option "fontHeight" : 10 (example), but this gives me an enlarged line height (free space between the letters in vertical dimension, like larger line spacing), but I'd like to get larger letters.
Executing

g.setFontVector(40);
Pixl.menu(mainmenu);

does not alter font size.
Thanks for any help,

Joost