Good stuff.
Some random observations. On my laptop, I prefer slightly smaller icons in Section 2 to those in Section 1. Also, at least on my phone all the icons in Sections 1 & 2 line up vertically in one column, so size does not play a big role. Icons in Section 3 line in two columns when browsing with my phone (Samsung S6+), I can see them all very well. Section 4 gets a bit too busy, as intuition himself points out. Section 6-F looks nice on my laptop, but you are right, on the phone it gets all weird.