Thank you for the look - it is great! But if you re-save the textures with the same PNG format but maximum compression - the file size becomes 2 times smaller without any loss of quality (because PNG compression is lossless). Here is the file with compressed textures -
https://mega.nz/file/lu5HGTgK#gyapOEApvYF0mNSjntbm_lv4IBuc9iCEF8-oTjLik_o
You can use a tool from this guide -
https://hub.virtamate.com/resources/a-guide-to-var-textures-optimization.27015/ or
https://www.irfanview.com/ which has a batch compression function to process all files in a folder at once.