The menu on the HUD is too middle (Should be in corners).
Use Anchor behavior with HUD elements.
When I zoom out for a split second I can see the white right side of the screen.
Make the background (the blue area in your video) larger. If your layout is 1280x720, make the background 1500x1000.
PS. Im still not sure how its gonna look on narrowest screens
I already told you how to test for different screens - use the Device Toolbar in Chrome.