Unfortunately there was a rather big flaw in the current version of the PCB, making the ESP32 non-functional. I had used a footprint for the ESP32-d0wd chip which is incorrect.
I am currently working on redesigning the PCB with a correct footprint.
With the current PCB revision, the USB chip however does appear functional as it is detected by my computer.
The PCB with the footprint flaw is shown below, it was designed using KiCad 5.