Ended up playing the game for a lot longer than I initially thought I would, and if that's not a sign of good gameplay, I don't know what is! As for what I'd improve, well, I'd change the "player money" label since I thought the "player" was my enemy. Also I got the ship down to exactly 0% health without it dying which I assume is because you checked if the health was <0 instead of <=0. Maybe some more variety to make the gameplay last longer, perhaps some rougelike elements, and you got yourself a high quality game!