Try to avoid of the flying home-fly and the bees... You are shooting the small molecules, that can stop the home-fly, but the bees are resistant to that. You can collect special points by touching (not by shoot) the green frog and the frog with a crown! Time also plays a role. Happy frogging ;) !

Home-fly hit by molecules = +1 point.
Contact with the home-fly = Game over.
Contact with the bee = Game over.
The bees are resistant to the molecules.
Touch the green frog for +5 points, but don't shoot on it!
Touch the frog with a crown for +50 points, but don't shoot on it!