Not unlike its countless brethren before it, up to two players defend their base from a never ending onslaught of randomly spawning enemies for high score chasing antics. (nintendowire.com)
Constantly spawning enemies keep you under pressure as the screen quickly begins to fill with death. (appspy.com)
With dynamically spawning enemies, these can potentially prove just as interesting, if not more so, than the campaign proper for a group of friends. (thatvideogameblog.com)