I tested it on the latest version of gzdoom and used ultimate doom builder with gzdoom doom 2 UDMF format and slade to make it and I got some custom monsters from realm 667.
The final area is still in progress. I will add more details.
It is meant to be played on the latest version of gzdoom.
https://www.mediafire.com/file/1d9v8de97hbms1t/Escapeb.wad/file
Please tell me what you think. This is the second wad I made so far.