This is really good.
2 things I really liked:
1. The look of your assets, objects' arrangement in 3-D space, the ship's movement, and the stretched field of view worked together to give a 90's retrofuturistic feel.
2. You made a palpable power curve. In the first level, I thought the enemies were too hard to kill. A few upgrades in, I realized that was the point, and it started getting easier to clear occasional enemies, but even then, only with careful targeting and persistence.
2 things I'd change:
1. I had a problem of the text appearing all scrunched together and couldn't read the HUD.
2. You developed a strong theme of self-determination on the game page. If you showed the star map at each checkpoint and plotted the course the ship has taken so far, I think it would help to reinforce that theme in-game.