This is a good work for a beginner. Yes, it's cubish, and too small, but gameplay is ok. Pity, there is no any secret room.
+1 for included source file

Agreed, this is not bad for a first map (especially one from 1996), but it does feel like someone learning the ropes.

With a bit more visual detail, slightly more involved gameplay and a secret or two, this could have been nice. As it stands, it shows potential and makes me curious to play the author's later maps -- if only there were any...

2 plus from me.

It's a playable, finishable level, which is more than I can say for quite a few 1996 maps. The visuals aren't very good, but it's a first map from 1996, so I won't blame it. The gameplay isn't great, but it's decent. There's some alright combat. For some reason, the first time I hit that switch and it said the door was open, it was not. I had to hit it twice. Also, I was not actually surprised by the Shambler, so I guess that means I should NOT trust Viper. Anyway, it's not worth playing, but it's a decent first attempt.

The Cult on The Quake Grave

I was expecting something like a ritual room but all I got was this lava pit. Not a bad map at all but nothing above average either. The map proves that Viper had the potential to go on and probably made some good stuff but unfortunately I don't see any releases by him past this one.

Standard '96 first attempt. Very small and pointless, boring mixtex visuals and too easy. Also, I was not surprised by that shambler at the end (you lied to me Viper). Not worth playing. 1/5

Not bad for a learner map, certainly better than anything I attempted to make back then. Not great, but decent for about 3 minutes of early custom Quake map nostalgia.

This map while decently constructed was not very memorable and too short gameplay wise to recommend playing through. 1out of 5 rating from me.

Small and simple, but for a 1996 beginner map it's actually pretty good. There are no real flaws except for one misaligned texture, and it's decent for speedrunning.

Square rooms connected by square corridors. Small map, with low enemy count.

Link to Nightmare 100% walkthrough: https://youtu.be/07EVQ_g-vqM