a very good idea and a well achieved execution, congratulations. I suggest adding more paths for the truck, so that trying to reach the cloud doesn't become frustrating. big hug :)
i like the mechanics that you made. i try to kill a planet but he stay very small and can´t detroy it :(, i suggest make more planets, with less live, and the one of the center become more big when explode the others :).. big hug