Epilepsy/10. Really simple yet fun game.
I would suggest a change on the settings screen key to something more intuitive (Esc would work great but I guess that could mess up with the full screen on browsers), or at least add an exist button there. The game should get paused when you open that settings menu.
You can get large scores if you keep flying in small circles. One idea I got to prevent players from doing that is adding a fuel meter you need to fill up by collecting items. That would force players to actually move around the map instead of staying in the same place forever.

Alternating left/right is an interesting control scheme.

I got a score of 2192 by doing nothing.

I got a score of 2052 by alternating left, right, forever.