The example projects main purpose is to showcase how things would work logically when you want to achieve certain things with GooglePAD, like fast-follow or Shop DLC purchases that unlocks content and some other things.
The first thing I suggest is to take a look at the documentation, it’s linked both in the top of this post and on the marketplace storefront! It’s a 30 pages PDF file, if you find it’s lacking information please send me an email and I’ll see if I can improve it 
In regards to how the size is reduced, check asset pack types under the Q&A section of the PDF, I go over it in greater details on there.
Thank you for your purchase, I hope you’ll achieve what you hope to achieve with the help of EasyGooglePAD!