Nice concept! Controlling a star using black holes is an interesting idea.
The gameplay works very well once you figure it out - it wasn't immediately intuitive that the gravity pull was stronger if you used the black hole close to the star, though it makes perfect sense in retrospect.
The visuals are very clear and nice to look at. It was easy to recognize the purpose of each object (though I didn't realize there were limited lives until I did, was wondering what the purpose of the hearts was before that).
The audio was good, too. I'm pretty sure I've heard the music several times before, but that didn't really bother me.
I liked the ending, even if it was a little abrupt and lackluster. Getting to join the other stars was satisfying.
One aspect I had a big problem with, though, was the vertical scrolling. The star got way too close to the top of the screen when going up, and way too close to the bottom of the screen when going down. Left too little room to react to hazards, and made it impossible to move the star slow enough to compensate for it (since there wasn't enough room to make a weak gravity pull).
Otherwise it was a very good game!