Great job! I did a quick run-through and found a couple of places to provide feedback. I like the aesthetic! Definitely a really cool spinoff of a "space invaders" type style.
Feedback:
- "how to play" menu explaining the controls. it took me ~1min to figure out controls.
- I found a bug (i think) regarding movement that prevents you from dying sometimes. If you keep clicking far below the spaceship, it will go off-screen and you can just click at the top of the screen. I think adding death boundaries at the top and bottom would fix it (or make it cycle as it does for the horizontal boundaries).
- I would probably make the death sound quieter or play loud background music as well.
Other than that, nice game!