What has been done so far? Not much really. I've worked through a portion of the official Godot Step-by-Step guide, and just reached the "Exporting your game" section. The result of the tutorial can be played here:

https://npexception.github.io/LD44/
(Don't open on mobile when you're not on wifi. ~15Mb of data here)

Loading takes a while, about 45 seconds on my mobile phone.

Instructions:
Avoid getting hit by the things. Touch/click anywhere to make the character go there, or drag to have it follow your finger / cursor.

Plan for tomorrow: Make a game for LudumDare I guess? ¯\_(ツ)_/¯