Ehehe, it's not as easy as it sounds. I tried it (for about 5 minutes, short attention span strikes again), and there's a lot to it.

You need to avoid any and all goodies, which in turn leads to avoiding all ammo, since that's 100 points alone, which makes it harder to destroy the enemies despite how you try to avoid them, but if you get hit by an enemy you'd need to get carrots, and that's a lot of points there. You also need to use all crates sparingly, and to avoid shooting or stomping too many blocks, as that creates points too.