Level F-1 is the first level of Sardine Can Levels. To unlock this level, you must collect all feathers in Pig Bang.
One sardine is the only way to total destruction.
Our priority in the Space Feather Levels is the unused sardine, so you should have 2 or more sardine cans to get the feather. Fire the first sardine can just northwest of the large asteroids, pushing them all the way to the eastern planet. This should trigger a wave of TNT and destruction.