Chicxulub! Earth is in Danger!

Description You are Chicxulub. Floating endlessly through the entire vastness of space. You do not remember where you came from. But you do know where you are going. An arrogant planet, Earth, has unknowingly captured your ire. You will unleash fury upon its surface. Dash into other space rocks and smash them into little pieces. Accumulate their mass to smash other, harder space rocks. Avoid other planets, lest you burn up in their atmospheres, and dodge their on-coming moons. Instructions W,A,S...