An enjoyable game at the start, however once you have gobbled up enough to become larger than stars, the other black holes will begin disappearing before they reach the centre of the screen, and are therefore no longer a threat to you.
However it was fun and relaxing to play, and I did like seeing my black hole get bigger and bigger, especially at the start when gobbling up all of the dust and asteroids.
I carried on until my score reached 16,707. At that point the planets were so spaced out that it took too long to find, and I suspect the game will never end anyway.
I do like your idea on the theme though, good work.
Also I found myself stuck on the credits screen before starting the game, maybe it's just me but I couldn't find a way off it.