I'm not this guy's apologist, but I can't think of any other games in which you navigate a bird between some pipes for as long as possible. Seems pretty original to me? Of course, if you're trying to say, "Well, it kind of looks like Mario Bros..." then I'd counter by asking, "What, then, qualifies as original?" You could make an argument that everyone except Pong (or whatever the first video game was) is unoriginal.