This game is too hard for me! My high score is 10. Even after reading the instructions (and thanks for the demo GIF, that really helped).
But the polish is good; I love the sounds and the background music, and the graphics are nice and polished too.
I'm playing on a laptop, where right-clicking is rather hard to do (and left-clicking isn't super easy either). I wish it supported some alternate inputs, like spacebar to shoot and (left or right) shift to swap.