That is amazing, thanks for the info! Got to check that out; just recently bought a micro:bit V2 for better Bluetooth support according to @bsiever, with the crossover intention of using the V2 as a controller for MakeCode Arcade or other inputs from the micro:bit to MCA games. -But this is just soooooooo 2019 compared to this, which I should have picked up on already from @AlexK’s post above!.. 
Maybe also worth it to check out the mouse and keyboard extensions, and maybe the data logger, for using hardware as input to the computer.
But these are all from hardware and to the computer/MCA. Apart from the planned mouse/keyboard support in MCA, are there any ways to get data from the computer/MCA to the micro:bit other hardware?
Here is a project sending serial data from a physical keyboard to a micro:bit:
http://www.suppertime.co.uk/blogmywiki/2020/08/ps2-keyboard-microbit/
But I have not yet found or figured out how to send data(maybe serial, Bluetooth or USB) from the computer, or even better, from a MCA game, to a micro:bit.
Would this be possible or does anyone have examples of this already done?
(Wish I had a faster brain and more time…)