Moon Defender is a free Chrome add-on developed by knightjohn410. As the name suggests, the game revolves around protecting a lunar base from incoming asteroids. The objective is to prevent the asteroids from hitting the base by shooting them down with your weapon. However, players must also be cautious not to overheat their weapon, as this can lead to a temporary loss of firepower.

The game offers a challenging and fast-paced experience, requiring quick reflexes and precise aiming. With each level, the difficulty increases as the asteroids come at a faster pace and in larger numbers. The graphics are simple yet effective, providing a clear view of the lunar landscape and the incoming threats.

Moon Defender is an enjoyable and addictive game for Chrome users who are looking for a quick and engaging way to pass the time. It offers a unique twist on the classic asteroid defense concept, making it a refreshing addition to the browser gaming scene.