Beware Planet Earth! combines tower defense and time management into an entertaining strategy game. Players must protect their cows from an alien invasion by constructing defenses and utilizing various traps and objects. The game requires strategic thinking and quick reflexes, as players can also directly engage enemies using their Zapper. With its unique blend of mechanics, it offers a fresh take on traditional gameplay elements.

The game is accessible on Mac and is available in a full version format. Its engaging visuals and humorous premise add to the overall enjoyment, making it suitable for both casual and hardcore gamers. The combination of building defenses and managing resources creates a dynamic gameplay experience that keeps players on their toes while they fend off the relentless Martian threat.