Hi Kyle, thanks for posting!  

This is actually possible right now with a little bit of custom CSS in your PX Survey Engagement. 

See screenshot below:

Here is the Custom CSS that I used so you can copy/paste this and try it out.

/* Customize feedback text font */
.bottom-feedback-container > textarea {
  font-size: 23px;
  font-family:courier,arial,helvetica;
}

I hope this helps!

Perfect! Thanks! Is there a way to customize the font of the preview text too -- i.e. the text that says “Share your thoughts about your choice...”?

textarea::placeholder {
  color: red;
  font-size: 23px;
  font-style: italic;
}

That works great. Thanks!