For anyone else playing this game, do not play it in full-screen (F11); instead, zoom out and play. Pressing 'Space' in full-screen shifts the screen downwards, and playing windowed makes the ship's off-screen.
Otherwise, I liked the game, though I'm unsure why the game can't be full-screened (Itch.io full-screen). It gets quite intense sometimes, and there are reasons to use the shield. The variety of sprites is great too, and is quite an obvious visual indicator of how the ships attacked. I only got a highscore of 12k, so there might even be more ships that what I saw.
That said, I think it's really difficult to aim, and honestly, you don't have to kill the ships, especially the straight shooters. Letting them pass you has no consequences, which might be considered a flaw, but I liked the risk-reward - I can let the ships get closer, letting them more easily hit me, or I can do my best to destroy them.
Overall, I enjoyed the game, though I do wish I could more easily aim.