You would think Earth would be blown to 20 million pieces and fly right out of the Milky Way by the cannon fire, but no. Apparently there's invisible, immovable nails that make Earth stay in spot.
Games like these need a way to prevent cheating. Right-clicking and moving the mouse to the winning spot instantly completes the level. I realize this is a first game, but I hope you will learn a method to prevent cheating in the future.