Wow, the visuals look great! I totally thought they were from an asset pack at first—I'm so impressed you managed to make that all in a week. I really like the different ships, and the shielded health system. but I found it hard to see the bullets, and even harder to try and dodge them. I would have appreciated some visual indicator for damaging the turrets as well, as on the first boss I had no clue if I was actually doing anything until one of them exploded.
Great job overall! I'm so impressed by the amount of content and that you did it solo.