Looks like my decision to abandon #µGame Turbo and instead focus on improving this library and making it work better on the original #µGame might have been right. New devices are popping up left and right. Adafruit has recently leaked some information about the Arcade FeatherWing they are working on, and now @Jarrett alerted me about a new device made by Odroid: https://wiki.odroid.com/odroid_go/odroid_go#arduino

From the point of view of hardware, it uses the same stuff as the M5Stack, so this library should already work on it. I ordered one ($48 with shipping for me), and of course will attempt to get my games to run on it. Still a bit more than the $11 I paid for the TTGO 1.0, but this one has the button and a case already. We will see how good those buttons are...