Put PICO-8 directory at /home/pi/ either via SSH then unzip, or manually by putting MicroSD in a computer and copying the files over.
Scroll down to the part about Launching PICO-8 from EmulationStation (about halfway down)
Follow these instructions through terminal (quit EmulationStation) and a Bluetooth Keyboard. Should work through SSH if that is your thing.
THEN, you need to run:
sudo apt-get install wiringpi
Start EmulationStation back up and you should have a launch option for PICO-8. Sound and Controls and Everything worked for me after that :)
Just bought a copy of Voxatron (and PICO-8 with it!) after musing over it as I wait on my PocketC.H.I.P. to arrive (fingers crossed for August)
Anyway, I am a Pixel artist and animator at heart (my heavily My Little Pony based DeviantArt page HERE ) that had been using Stencyl for sometime and decided I needed a breath of fresh air ;)
Hope to be talking a lot with you guys as I learn the ropes of this new environment :)
Oh, and any help or guidance of any sort would be greatly appreciated!