Derrick Steel sums up the game succinctly in his entry on MobyGames: "In what has to be considered one of the most "original" games of all time, you are a flying beer in space. And the evil corporations are coming after you, so you must use your "beer power" to fight off wave after wave of corporate beer." To be more precise, your goal is to defend the Eichhof Brewery from the imperium of invading "big beers," with bottle caps and other imaginative weapons that only beer lovers can appreciate ;)