Good work! There's an interesting core here, and I agree with the other comments on a lot of points here. Couple additional notes:
- I couldn't tell what was responsible for where my shots went. At first it seemed like they just always went to the right regardless of my ship's orientation. Over time I started getting more projectiles but as far as I could tell the pattern was static
- The pause menu is bugged. Opening the pause menu using escape works fine, but if you click the mouse it will process the input on the pause menu without necessarily opening it. If you click slightly above the ship (where the resume button is), the menu will show long enough to have a fade-out effect. If you click on the ship (where the restart button is), the game will restart. If you click slightly below the ship (where the quit button is) the game will quit, which for a browser build just means it will crash and require you to reload the page.