Well, that's Tetris...with blood.
Just when I was thinking that you hadn't included any difficulty ramp-up, those body parts started flying down the screen. It's as fun as Tetris has ever been, great job.
Next time, please include a couple different sound effects. When you're powering through the falling pieces, that yell and chainsaw sound gets uber-repetitive. Wait, maybe that's the "horror" element. I see what you did there.
Great idea and fun way to mash up ( or chop up ) two genres.