First of all. The assets are very well done. I really like the starry background and the detail on the ships. Really looks great!
The shooting sound effect was good but it was peaking a lot. Maybe some background music could help the mix.
As far as I could tell from playing, the movement is tethered to shooting. I really like this as an idea! Once I got used it, it was fun to sail around by shooting in the reverse direction. In the future, I could see this mechanic opening up a lot of interesting puzzle/combat scenarios.
That said, the spawning and placement of enemies feels a little unintentional at the moment. There is a dense cluster of enemies at the beginning where it's hard to strategize around, and then a lot of empty space on the margins. I guess that's kinda like space itself in a way! Still, I think it would do you to spend more time placing enemies carefully, either procedurally or by hand, to give the player a sense of pacing (which doesn't have to be linear or whatever else).
What you have here is impressive and has potential! I think all my criticisms here are just a part of having limited time.