A year after the incident at the advanced research facility, the demons have infested the city. The ground cracked and the atmosphere turned red, hell portals appeared letting demons flood into earth. You're on your way to destroy the main hell portal, until the path you need to take to get there crumbles before you, and you have to take an alternate route.
I added a fog effect that makes it look nicer, and I added 6 new levels. Just 14 more levels and then I'll be done. I'm thinking of also making a separate wad of master levels.