Thank you Alex.
So... how does it work? I believe I've discovered the following:
Up key: Increase radius.
Down key: Decrease radius.
Right key: Cycle asteroid owner (right)
Left key: Cycle asteroid owner (left)
Pg Up/Down: Increase/decrease energy, strength, or agility stat. Can't remember, and can't be bothered.
But where does the asteroid info go? I checked my level1.level file, and it seemed unchanged. And since it's just an .exe, it hasn't made any directory... has it?