So the UI is a Discord clone, I think that's worth mentioning. It's not a bad thing, quite the opposite: Discord nailed it in that regard.
Now are the chats end-to-end-encrypted? It only says calls are, so that remains ambiguous. I believe that would be a major sell for current Discord users.
What's the point of end-to-end encryption on a group chat where the entire group can decrypt it?
Discord users want end-to-end encryption to prevent Discord employees and outsiders from reading their chats. This doesn't have that risk, because the in-group runs the server.
Now are the chats end-to-end-encrypted? It only says calls are, so that remains ambiguous. I believe that would be a major sell for current Discord users.
Overall looks like a great app to try out.