Play UFO Defense free Online. Arrow keys or tap to shoot white or black. Shoot enemies and clear the boss to complete each of your missions. Defend earth from the invaders! PlayGames365.com offers you the best entertainment of games to play in the browser, the most distributed from the 2000s until now. UFO Defense is an HTML5 game that works on smartphones, tablets, PCs and Smart TVs. You can play UFO Defense anywhere, anytime.