Dang it, I just posted a huge reply to this topic, but the forum ate it and I didn't have it saved. Anyway... Here is some music you can (legally) use in your game that I thought fit well:
http://ocrmirror.iiens.net/files/music/ ... _ReMix.mp3some ideas for concepts:
change the attract and repel buttons to the left and right mouse buttons. make no button pushed = no effect on the stars
make a level where the player has a limited amount of clicking time and has to move stars from one point to another
have the player make a certain formation with stars--would require a fairly complicated formation recognition system
enemies(moving black holes?) that eat your stars, the player has to avoid them on the way to a location. the right clicking could serve a useful purpose by spreading out your stars so the enemies could only eat a few of them. I would make the enemies a little bit faster than the stars.
It's a pretty demo, and I think you could expand it in many different directions. If you decide to abandon it I would love to play around with the source files. I like it!
Zygo