I thoroughly enjoyed that, some good use of Arch Vile jump scares and monster placements, was a very well designed little course of events, finished the map with 100% secrets, although, I did find one weird thing, I finished the map, and it showed 99% kills, I reloaded my save and even used IDDT (twice) to show monster/items, I couldn't seem to locate a lone monster anywhere in the map, maybe just a glitch on my end.
All in all, I really enjoyed that little experience, very well made wad and I hope you continue to make more, this map is a true sign you have great potential and you should consider a project of some sort in terms of a multimap wad.
Never be afraid to try new things aswell as you make more maps, learn as you go, thats what I do :).
Thanks.
LAGI.