Awesome game, but it kinda sucks that you have to wait for the waves of enemies to arrive. IMHO, the best defense is a solid offensive. Also, the chiptune music is rather upbeat but one of the tunes caused slight tinnitus in my left ear because it ends on such a high note (I'm a metalhead in my 30's, and I have slight hearing loss due to my love of Sabaton & listening to heavy metal very loud).