Halfway there!
Well it’s the morning of the second day now and I finally fixed my ‘World Eater’ bug – this was where my player entity randomly erased the background… permanently.
I finally have something playable – in the sense that you can lose (and not win :P) – if you want to have a look, it’s here:
Instructions – Not much so far, press n, c, h, e and b to load the different worlds, arrow keys to move, and you can collect stone (press space) and die in lava 
Polar
NB: Yes, I know its partially inspired by Minicraft… but it was all that came to my mind 