I'll start by saying it's hella fun playing this demo. Visually it's amazing considering it's very early stage and runs great on my potato computer.
I know you'll be adding key binding and control options which I really would like to have. Planes look great, weapons look great, and the excitement of chasing enemy fighters maneuvering like an ace pilot... you nailed it.
I get freak out when getting attacked from behind then I do a cool slow down + turnaround to get behind them. it all works beautifully.
It's not without flaws, though. I can fly thru water and when I go back to main menu, mouse disappears(or doesn't reappear from hiding in combat).
Great job and keep it up!