Some suggestions
Hey man, I'm a professional programmer and these are my thoughts. Not bad. But the following are things to fix:
Make the graphics less pixelated, even if it means sacrificing size or the amount of things on the screen.
Nobody will want to play a whole game with just the imperial march playing, develope a soundtrack.
Make the gunfire of your ship visible, i barely knew I was shooting.
Make the ships lasers click and dragable, in the movies they had rapid fire, the user should have the same.
Make sure the ship doesn't leave the screen when they move the mouse to extremes.
If you need help with any of these algorithims or anything feel free to e-mail me.