Tried your game. Right off the bat, i can say the concept is good, I see the vision. Art is good. HUD is good. Jet flames afterburn looks cool with the 2d effects.
That said, there are a few issues, or maybe just things I don't like.
Red blips/markers on enemy ships, uh, need to scale with how far it is. Otherwise it's hard to tell, yes there is a minimap, but still.
Secondly. When they fly past you it's disorienting, there needs to be an arrow marker/indicator to help reorient yourself to aim at a ship flying past you.
There's already a marking system for asteroids, there needs to be something like that for ships.
You'd probably add that later tho this *is* an early prototype.
Also some ideas, but maybe you can add homing missiles? For when you lock onto an object, you would be able to fire a homing missile or two. That'd be fun.
Aiming is very hard. Especially the enemy that moves a lot (though that was the intention, I guess). You could make that easier? But then again the only plane fighter I played was on the PSP.
Anyways, all over, good demo. promising. Good luck!