I like the overall look of the game, especially the trees. The music track isn't an annoying loop either. Maybe make the robot move faster, and start the screen full zoomed out. It took me a second before I figured you could move the camera. Maybe add a level select screen as well.
The AI ship felt a little weird in terms of aiming, player aiming also felt slow if you just held down left click. I let the AI die and the game still played basically the same in terms of difficulty.