Everything I can share about tinygo with the Pygamer from Adafruit.
First, follow instructions from https://tinygo.org to install tinygo.
Next, install drivers with the command:
go get tinygo.org/x/drivers
Go in a folder and use the command:
tinygo flash -target=pygamer
Note, as mentionned in the tinygo documentation:
Press the “RESET” button on the board two times to get the PyGamer board ready to receive code.