Once I got moving in one direction, I couldn't really seem to change direction. Couldn't really tell which part of the ship was the front, which didnt help. All the stars just kept flying down. Going left or right would just make them go slightly left/right.
Also, looks like the starfield is a static one in the background, and a moving one on top. Here is some code I wrote if you want the starfield to be more pseudo-3d:
https://github.com/csclyde/VectorLance/blob/master/src/proc/Background.hx#L58You can see the effect here: