[The Mothman]

Can somebody explain to me why this game is so damn addictive? I have sat on my ass al freakin' weekend playing this, and have never once gotten bored of it. And it is so repetitive as well, the only thing that there is to do is to go around slashing poeple. There are no special mini games or goos plots. every level is the same: you are surrounded by a couple hundred enemies, kill them all. I get about 350 kills per level. thats alot of repetitive gameplay, but yet it is so much fun.