I me made the game in Unity2D and added a whole lot of new features and better controls. Try it out https://dl.dropboxusercontent.com/u/7343751/Asteroid%20Bust%20webplayer/Asteroid%20Bust%20webplayer.html

Ludum dare entry: 

Now:

Link to entry (windows):

http://www.ludumdare.com/compo/ludum-dare-28/?action=preview&uid=27122