I didn't even notice the score was broken XD
You ship's hit area is a bit unclear though and the boss could have some shooting sound effects and the music could be more action-y, it is too ominous and relaxing. Some of the attacks could be better telegraphed, with some sound effects
Other than that, the gameplay is fun, the art is good-looking and the different ships every time you die keeps the game fresh as you go
Nice work! :D