Fun game, but on my computer it had a lot of issues.
When the plane did its roll animation, it would flicker on and off.
When changing the plane from going right to left, the plane would only fly upside down. Going to the right it was fine.
The afterburner and bullets weren't spawning in the correct place even at the start of the game. And if I did the double tap left/right thing, those effects would spawn even farther away from the plane.
As I'm guessing you already know, when I changed my secondary weapon with SHIFT, the graphic for it no longer appeared.
Upon trying to exit while flying, it would send me to the main menu but it was a white screen except for the back button. My mouse worked for about 3 seconds and in that time I flicked it across the screen and the center buttons(campaign, missions, options,etc.) showed up but were unusable because of the the mouse and keyboard not responding.
Great job so far guys! Hopefully it won't take to long for you to fix these graphics issues.
AMD Sempron 2800+
ATI Radeon 9600SE