The top review for this gets it all wrong. It's not a porno lol, lots of tits, but you'd have to be very prudish to call this porn. Nor is it a slasher, there's very little blood at all and no gore. Finally these actors fighting The Invisible Maniac is endlessly entertaining.
What is here is a very surreal character study. It's very much feels as if it's the kind of movie you'd see in the background of another movie. Everything is over-the-top except the budget. The acting is perfectly bad and there weren't any lulls. Really surprisingly good.