The chat is already implemented, you have it when you are on the lobby (room list) and in game, you just have to press enter to open the chat.
About the anti-cheat, right now it's hard coded and crypted client side and the network is is a relay server/client. I can do it server side but not really needed at this step. Also, most of the web browser don't like when you touch at the memory and crash in most cases.
Thank you for your test.