Orbital Destruction 1.0

Orbital Destruction is an action game in which you must defend the Earth from extraterrestrial invasions. The objective of the game is to destroy all enemy vessels without being killed. You will face different ships that will fly around you trying to destroy you. As you progress, more powerful weapons will be provided since the enemies will increase in quantity and strength, thus making the game more challenging.
Unfortunately, the game provides only one game mode, and multiplayer isn't supported, but it has four difficulty levels, namely Novice, Expert, Master, and Veteran. I played in Novice mode, and it was really difficult, so I can't imagine how challenging the others are.
Regarding the graphics, they are are detailed and very attractive, providing a marvelous view of the Earth from the space. Sound effects and music are also great and contribute to creating the necessary atmosphere for the game.
In short, Orbital Destruction is a challenging game to play for a while, but it doesn't include much variety, and you may get bored soon. Fortunately, it is free, so you can play as much as you want.