It looks similar but it’s not our Earth. The main difference is that we don’t travel with our Sun through the universe.
The idea is just crazy the Sun there is travelling and planet Terra must go to. Your task is using various planets to defend your home planet. One shoots, other creates shockwave and the next one fills lives. The enemies are meteors flying around. It sounds easy, but you are limited by resources. These are filled by collecting diamonds. The game reached nice place in the Ludum Dare competition thanks its interesting graphics and style.