A demake?!  Never heard of such a thing; really interesting concept.  Very easy to discern things from each other, and very easy to tell what's what.  Good stuff.

Only 2 colors per 8x8 pixels. The palette is 8 colors with additional 7 "bright" colors but cannot use together bright and dark.

I think using black at all times is mandatory because this palette is so bright.

I think a good result, what are the limitations of spectrum?.