I like the "asteroids"-basis mixed with the "find your way" gameplay.
I managed to finish it in the 6th attempt, those damn black holes... *grrrr :)
Nice clean graphics (cool, you used SVG as i see on github) and soundeffects. The explosion particles could last longer. I guess, you are calculating the lifetime of the particles based on fixed values not delta-time-dependent (as i did not find any calculation of "time since last update" in your code)
But its a good game!