Considering that there's no one definite way to play this mini game, it would be tough to talk someone through it.. But basically, try and aim your path so that you'll pick up more than one or two stars at a time. Like Kokirion said, you may see a "line" of stars, so try aiming through it. I find that it's easiest to zig-zag my way across the cage, so that when I aim to get to the other side, I'll pick up three or four stars along the way. This helps get rid of the bulk of them, then pick up the leftovers individually or in pairs if you can...