Ok, so I think I have some ideas to make your design a lot better.
so, to start off, I think you should add some color and brighten it a bit.
It might be a bit hard to see the difference, so here is a comparison gif:
Ok, my next idea is this, completely move and redesign the friends bar:
for people with more friends you can add a left/right scrollbar.
Then, if you do that you can then, move the tiles to the right:
and THEN, you can give the chat more room:
And, my last but certainly not least idea, the top bar looks kind of, clunky/outdated. It just doesn't look like a smooth, clean, and flat UI. Which is a big requirement if you want it to look nice and professional.
here is what I mean. This is tower unites current top bar UI:
And then here is yours:
The thing is, people like, clean, simple, easy on the eyes, and sleek UI's. I think if you can redesign the look, and style of that bar, it would change it for the better.
Well, anyways, I hope I provided some help. And gave you some ideas.