Earth Day may have passed, but that’s no reason for you to stop protecting planets. This barebones Android and iOS game has an endless number of purple and pink asteroids hurling through space, vying to hit this one, small, nameless planet. Thankfully, this planet has a moon (that’s you) to protect it, by slamming and breaking up these massive rocks before they hit the planet. Debris from asteroids you smash break up other asteroids, which is how you rack up your combo score. What’s neat is that the more you protect the planet, the more it grows — with a dragon flying around it, followed by a blimp, a satellite, and more. You can also collect coins during the game and purchase different moon “skins,” like replacing it with the Death Star, or a basketball.