Here's a little feedback on the app from me:
1. When I am getting to the end of the message field while typing, it should continue in the next line (vertical) instead of in the field (horizontal), just like in any other messenger app. It's much easier to scroll up or down than having to go left or right to re-read the message.
2. this one is kind of related to #1, that's why I am going to add it here as well.
I like to organize my message with paragraphs but since you have replaced it in your app with a "Send" button, I cannot do that. It doesn't make much sense to me, tbh, because there is already a "Send"-button.