This update adds two new options, both under Settings > Appearance, designed to help with legibility on small screens.
The first (Menu text size increase) allows you to increase the relative size of most of the text of the game by up to two increments. In some places (control editor screens, sound and playlist screens, and so on), the text of some buttons is automatically sized to fit the screen, so that text can still be small, but in most instances the text will increase in size.
The second (Hint number size increase) allows you to increase the size of hint numbers in puzzles by up to two increments. Note that this can make the hints appear cramped.
This update also makes minor adjustments to most of the built-in themes (with the exceptions of the Purple, Ice Blue, Light Blue, and Print themes, which were already fine), primarily to increase the visibility of faded hints. This does come at the expense of faded hints not contrasting as well against unfaded hints, but I think it is for the best. In any case, if there's anything you don't like about a theme, you can always create a copy of it, adjust it to your liking, and then use that copy instead.