Disrepair is a 9 (10 counting secret) map episode that makes use of G/ZDoom enhancements, including, but not limited to, DECORATE monsters, 3D Floors, and Scripted Events. There is also a Survival Mode included, which changes seven of the maps into an endless horde mode with some slight objectives.
Credits:
Mr.Freeze and PRIMEVAL for allowing me to use some of their music, and nub_hat for making his own for me. As well as realm667 for providing numerous resources