Yeah i could agree a bit, i personally have no problem reading the arrows, but i would say they are a bit small to see, and the columns are a bit too spaced for me.
Also, it doesnt necessarily matter which way the arrows are pointing as long as it gets the job done. If you go and look at some other rhythm games that have customizable skins, you would see that, yes there are some that have arrow skin pointing in different directions, but there are also skins that have something like circles, where it doesnt matter which way they are pointing as long as you can read them.