Oh, actually, if you can handle the choice menu being ugly, I have a workaround for you that will at least let you play the game:
In the directory "Princess_Tower-v.0.5.hotfix1-pc\game\scripts_mechanical" is a file named "gui.rpy". Lines 219 and 220 of this file are:
define gui.choice_button_text_idle_color = gui.idle_color
define gui.choice_button_text_hover_color = gui.hover_color
You can delete those lines and copypaste the following as lines 219, 220, and 221 (it actually doesn't matter where any of the lines are in the file, but whatever):
define gui.choice_button_text_idle_color = "#aaa"
define gui.choice_button_text_outlines = [(1, "#000", 0, 0)]
define gui.choice_button_text_hover_color = "#fff"
This will end up looking pretty jank and probably mouse hover will be a bit jank (you might have to hover the text itself instead of the button area), but the text should be a light color with a dark outline and thus legible.
