This self aware b-movie was a fun Octobor movie.  It didn't take itself seriously.  At one point one of the characters exclaims loudly, "What is this a bad horror movie?"  That's pretty much why this movie works.  It does not do much that is novel, although it goes further to explain the mysterious origins of the alien leeches than most movies bother with.  While there is plenty of cliche and trope, it does have an atypical set of protagonists, and where many films probably would have given the disabled friend a chance to recover from his zombie illness I was gratified that they weren't afraid to kill him too.  It was probably fun to make.