i beat the level mode. my tips are to kind of feel for the gravitational pull of larger planets and when you do, skirt around them and pull in the little asteroids that they have and maybe some smaller planets around them until you are big enough to take them on.
 "A Knight's Story 2"){kind=icon}
 "Madness interactive - Next-Gen mod"){kind=icon}
 "Epic Combo!"){kind=icon}
 "Cosmic Crush"){kind=icon}