For some reason "Demon Shooter by Vinny" flickers? Is that a problem everyone gets? Is it your code?
The control scheme is a bit odd in my opinion for the right player. It just feels weird.
Btw you should make your own ships they would probably look better you don't even have to go into high detail just make them look retro-ish. The bullets are too small as well in my opinion. You could scale them up in Paint.NET or whatever you use or just make a simple bullet yourself. Both would work.
Other than that its a good start