Asteroids-Like Space Game - In need of creative input

[Mutrify]

Hi, as the title suggests I am making a game and need some suggestions.

Here is the game:
http://www.mutrify.com/index.php?navID= ... ng&pID=one

It's in Flash and AS3. Right now the movement works pretty much like asteroids, you have a ship(arrow), you can accelerate, rotate and use brakes. Then there are planets and gravity. (Check out the link and you'll understand what I mean)

Flying around and playing with gravity is fun and all, but my problem is; I have no clue what should be the objective of this game, I'm open to any and all suggestions! Obviously I want it to be fun and challenging, preferably never-ending. Hope some of you can help.

[lalacomun]

Well you can make something like asteroids with many levels and some rpg elements like levels, skills, diferent weapons etc
and by the way nice work!!