The architecture and aesthetics are really impresive. Amazing that it was made in such a short time!
I had to play with IDDQD just to see the map, though. Evading groups of archviles coming for all directions for such a long time is way too much for me. xD
However, when I tried playing it in Chocolate Doom to test if it was vanilla, it didn't work at all, it made me weirdly noclip through the first red door. o_o
It's actually in Boom format, right?