In Greek an even, level, smooth; used in the sense of "flat" or "plane" would be termed as homalo- or homal-.

Perhaps you could consider this:

homalambulophobia

noun

 

a fear of walking on or of touching even or smooth surfaces

In Greek an even, level, smooth; used in the sense of "flat" or "plane" would be termed as homalo- or homal-.

Perhaps you could consider this:

homalambulophobia

noun

a fear of walking on or of touching even or smooth surfaces