Are just the visuals the problem, or are dialogs mentioning that they are spiders also an issue?
If it's just the visuals, a quick fix you could try to do yourself in the current version would be to go to the www/img/enemies folder, remove the "Spider (2)", "Spider Girl big", and "Spider Girl small" files, copy the image of a different type of enemy in the same folder, and rename the copied enemy image to the same name as the three spider images you deleted. I think it should show you the images of the other enemy in battles then.
The same could be done with the spidergirl images in the www/img/pictures folder for when they are shown as CGs in the game outside of battles.
I'll check if there is any good way to make these images change for people with such a problem.
Viewing post in An option for arachnophobic ppl
Well I'm on android so modding will be an unavaible option for me and no it's not the spider girls it's the REALISTIC ones from the tower and on the other npc encounters. The word "spider" is not scary if it would be then my favourite movie wouldn't be the amazing spiderman. But if it will be too much work for you then don't worry I'll just activate tsubaki's skill and close my eyes so that the battle will end automatically