Can you verify that you have continuity between these points?

For what purpose? All of the systems that use analog sticks do not work on a Pi Zero (aka, you wouldn't use it anyways). Plus, there is just plain no room in the tin so put the required hardware in to it. There is very minimal room with all the hardware that is in it now.

Kite does preorders every few months. Keep an eye in the for sale section and/or sign up for his waiting list on his website: https://kiteretro.com

Make sure that you are using the correct image: https://www.mediafire.com/file/g6rrvgi9 ... 21.gz/file

Honestly, a 16 GB will suffice just fine. I have just about every game that can be played on the MintyPi and it all fits on a 16 GB card with room to spare.

Make sure you are turning FTP back on in the retropie menu. You have to do this every time you disable it or reboot the system.

You just FTP in to the system like normal and delete them. If the games still don't work then you might have a corrupt bin and will need to source another version.

Are you using this image? https://www.mediafire.com/file/g6rrvgi9 ... 21.gz/file
Located from: https://sudomod.com/mintypi-updates/

https://www.youtube.com/watch?v=YqE2x-0JYzs at 10:15 would be a good place to start.

Is the battery seated correctly? Have you tested the voltage on the battery? Are you using the correct USB C charger? (5v, so not a Pixel or switch charger) Can you post pictures of the board, battery, and the wording on the charger?