The first time I tried to watch it, I dozed off at about the 45 minute mark, which doesn't seem to bode well for this type of show. I finished watching it the next evening and the pace of the second hour seemed a lot better. My favorite scene was the one with the riding lawn mower.
It feels like a show like this demands killing off at least one or two characters per episode in some new gruesome way. You can maintain that pace for a two-hour movie, but it seems like they will run out of characters before they reach the end of the session. Of course, perhaps the last man standing will be, by default, the person in the red devil mask.