Since the Playdate exposes a serial interface when connected to a PC via a USB-C cable, it's sort of possible to get Lua games to communicate with a PC by misusing the
eval serial command to send data in and
print() to send data out.
It would be great if there was a simpler way to achieve this "officially", maybe where a game could register its own serial commands with callbacks that get fired when they are received, and send out serial data to whatever is connected.
Additionally, if it would be possible for two Playdates to open a serial connection between eachother when joined with a USB-C to USB-C cable, this could allow for simple Gameboy-Link-Cable-esque multiplayer (for people who are lucky enough to own multiple Playdates!)