From the publisher:
What is DEVILMOUNT? DEVILMOUNT is a fully-playable parody of the OSR's infamous "lost dungeon." The draft manuscript has been heavily re-flavored, revised, and edited into a new experience. Instead of being reverential toward the idea of a Gygaxian megadungeon, DEVILMOUNT reads like a dungeon created by a sixteen year-old who is into Satan, ufo conspiracy theories, and drinking cough syrup.
The "'lost dungeon'" in the description is Dwimmermount. Devilmount is a parody of a dungeon that, as of Devilmount's March 2013 publication, has only been published in draft form. It was deliberately published with only the artists credited.