WARNING: DO NOT STORE ANY IMPORTANT DATA ON IT AT THIS STAGE. IT ONLY JUST WORKS WITHOUT CRASHING.
Get the binary and release notes from here and see the forum post micropython.org
Also Github repository tag alpha-1 where you might have come from. It's my first real use of github so apologies if I haven't done it right. There seems to be an issue building mpy-cross. Whatever it is didn't bother me perhaps because I had mpy-cross before I started so perhaps there is an unnecessary dependency on the C by mpy-cross. Don't know.
Credit to Peter Andersson (Mr. SPIFFS) and of course the MicroPython folks.
Contact me at spiffs---REMOVEemail@example.com