Good game and fun to play. The image didn't bother me. Maybe it would look "nicer" but I don't think it would anything special to gameplay. Only complaint was the boss battle. A touch annoying and i think adding a slight "pull" when you become a black hole to even the playing field a bit with your opponent would be a decent addition.
Very well done!
But like the 3 before me, you could have made it look better!
I'm a big fan of absorb games like this. They are all usually very fun.
The only thing that needs improvement on this, is how it looks. It could really look a little better. It would also be cool if you could chain the stages together, instead of making it end and you having to choose the next type.
Not very original.
Next time, make it look nicer. Also, put in gravity.