(Keep in mind I am on a laptop)
So for starters when you click in the message box the "Send" button disappears, I think this is what will drive people away.
You have "0" notifications when you have chats, what I mean by this is you have an orange 0.
When chatting, I like to just sit in the room with whoever I'm talking to, but I noticed their latest message doesn't pop up on the screen till you put a message, so you either have to leave the tab and go to a meme, stream, etc, to be able to see their last message.
Users with long names get misaligned and makes the whole screen unorganized.
(If you found more feel free to add to the comments of this image)
(I will update if I find more problems)