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It would be nice if, while you're you're guessing, the words in your own history have an indicator of whether each was too high or too low.

It does. The blue word is the closest guess before and the red word is the closest guess after.

Would be nice if it indicated it in some way beyond colour-coding, for the benefit of the colour-blind and those who don't catch on.

Blue-red colorblindness?

blue-black colorblindness at night: https://justgetflux.com/