i don't, I'm sorry. :< you might find some luck looking online? i know there are brush libraries and custom ones from others! and there might already be a pixelated brush in the program (im not sure because i don't really use csp!) but wishing you a good day anyway :3

your art is very cute!!!! :D also, i use a pixel brush on a normal sized canvas.. if you find one, maybe that will work? 🤷‍♀️