Nice improvement over the first part. I like that ship's controls are more realistic, too bad there are no visible frontal thrusters for backwards movement, but at least the ship doesn't move sideways like in first part and turns to where it is heading properly.
The game is fun an beautiful. The story, while not really required is nice and meaningfully written, I enjoyed that.
As possible improvements I could think about upgrades visually changing appearance of the ship and maybe some boss waiting for hero's ship behind the barrier... maybe you can make some of that in Galactic Survivor 3, should you make it to my delight.