I was wondering what limitations there were on what fonts you can use. Is it just a certain few, or can you use any font as long as it clearly represents the ASCII fonts/characters?

As stated in the rules https://itch.io/jam/text-only-jam-2/topic/1291915/official-rules

• Use any font similar to the standard ASCII graphics as in the chart, such as cursive, bold, all-caps, or “handwritten” fonts.