[Enter]=Type a message / Send the message
[Up Arrow]=Scroll Chat Up
[Down Arrow]=Scroll Chat Down
[Backspace]=Remove last symbol
[Shift]=Capitalize 1 letter
[1st]=First Page of symbols
[2nd]=Second page of symbols
[X Button]=Hide / Show chat
[+ Arrows Button]=Move chat around
All Other Keys will type their corresponding symbol (obviously).

This version has line breaks that keep whole words together, faster visual updates when scrolling, the ability to move and hide the whole chat, the ability to type your own name before joining, and lots more.
You can still find the first version of this here:
https://flowlab.io/game/play/1968286