Well executed!, I like music & sounds. Ship could move a bit faster sideways.
Together with the background starfield, the created athmosphere and gameplay is quite fluent, with addictive arcade-game qualities!*

The game hangs together well and is intuitive to play.

I agree with your "few next steps".. adding more variation for the spawn rates and asteroid behavior help would keep me hooked. Otherwise, maybe exploring the ship's movement feel (add some momentum? ability to "boost" or do something jump-like?) or juice (visual/sound) would make flying and dodging extra fun.

Nice work!