Really cool! Fun concept & story! I died in sector 2, but I will try to destroy every sectors later for sure!
Also, if I may, you should set the viewport dimension of your game (when you edit your project) to 480px width and 432px height so that it renders properly on your Itchio page project as follow:
That's just a small tip if you don't mind. ^^
Again I really did enjoy the game. Congrats!