Raridoom Custom map 2 ('the Source') v1 beta

oh... at first I thought it's not convenient for enemy placement... now it's too difficult to pass this completely on Hard. Also some bugs. Not just the changelings. Glitchy teleporters, textures, elevators that I don't know how to fix... (EDIT: now fixed) and it's so big that built-in textures are insufficient.
The map is based on multi-state elevators logic.
Based on Raridoom ( http://raridoom.blogspot.com )
Map by _entro