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Become a space hero in UFO Attack! Defend Earth from relentless alien invasions in this thrilling online shooting game. Use your mouse to aim and shoot down incoming UFOs, dodging obstacles and trying to survive as long as possible. Can you achieve the highest score? Play now for an action-packed adventure! Tags: Action, Adventure, Aircraft, Arcade, Game, Games, HTML5. Category: Adventure. Instructions: Tap to Play. UFO Attack, alien shooter, online game, shooting game, arcade game, HTML5 game, space shooter, defense game, survive, high score, action game, adventure game, aircraft, arcade, games, adventure