1-bit & perception of dithering/print can be quite quite fascinating really. I actually had to double-check the dither post process shader I wrote half-way through the week because I thought a bug had crept & I was outputting more than two colours ; but no, that was just an illusion & it fooled me too.
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We also experimented with different colour pairs before sticking with this one (inspired by the Playdate display), which were interesting but ended up giving the illusion of three colours (dark purple & off-white is a good example which gives off the illusion of an additional yellow colour)
Anyway, thanks for playing & for the kind words!