I decided to play by myself, as I have no one with me right now... lol
The game has a good premise. I liked the graphs and the background music.
As for the gameplay, I found a bit too simple with the screen always moving in the same direction. It would add a lot more fun to the game having the blackholes moving around, instead of the screen, and making the opponent planet bounce off when hit by you.
Now, with time, you could implement a simple AI enemy, so lone player can also enjoy your game.
Congrats for participating! Keep it up and you may have a good game!