Followup: I find the keys too small for my large hands, a shame since the keys needn't be any smaller than Apple's.
My ideal keyboard layout would have an additional number row, forward delete, left and right arrows, and symbols and punctuation in the same locations as every other QWERTY keyboard in history, not counting Apple's.
Also, while the concept of showing the shifted symbols is good, light gray on white is extremely stupid. With iOS 11, I can't find all the characters I need!