Hi! I'm glad you enjoyed the game so far. :)
I'm sorry the font has been causing you eyestrain. I'll look into how I can integrate a couple font sizes in the settings of the game. In the meantime, I recommend using the alternate font, open sans, which is easier on the eyes in my experience, and your browser's zoom-in feature, which should allow you to get a bigger font without interfering with the UI much. It might persist throughout my itch.io profile and my other games if you don't change it back, though.