Worked on the HUD today. The score and lives are now drawn directly onto the canvas so they match the rest of the game.

I also added a kill streak multiplier. It increases as you destroy enemies without taking damage and can reach a maximum of 5x.

It gives the player a reason to take more risks instead of always staying near the bottom of the screen.Lives are displayed using small ship icons rather than a number, and the high score is now saved with localStorage, so it remains there after closing or refreshing the page.