This would make a great mini game.
For a functional game that is not spam, I'll start you off with a base score of 5.
What I like:
+1 The loading time was fast
+1 The controls were smooth without being slippery. I could easily maneuver between the shapes
What I didn't like:
I didn't see any true flaws. Everything worked.
Suggestions:
If you treat this game as a stand alone:
1. You could add music
2. You could add sound effects for every time I hit a shape.
3. You could add a small story that explains why I (the player) need to capture stars. (The story doesn't have to be anything grand. Maybe I'm piloting a space ship that needs to hit enemy alien spacecraft and avoid asteroids. In this case, you could have a short series of text blocks explaining why I'm piloting a space ship and why there is a war between us and these aliens)
This would be an excellent mini-game (if you were to change the graphics a little)