For the most part I do like the textures. I am kind of a wad fiend so will look at them in more detail.
The map was fun and very good for a first map.I must say it's probably too easy on Skill 1 because I am a pretty crappy player as you can see if you ever watch any demos. I was playing this at work with a trackball so sorry for the herky-jerky movement. I was playing very cautiously so I only died once. 2 demos here:
https://www.dropbox.com/s/6ugey07slx60gvq/base1_dumptruck.zip?dl=0
I gave you some notes in the demo but I want to add that i think there are too many crates. This is a very doom-y map - and that's fine but add some interesting details to your base. Also the stairs are kinda bland at the moment. Maybe some side with interesting textures and such.
Play Arcane Dimensions: Critical Error map for the pinnacle of base map design. (IMO) It may be some inspiration for you. Here's a 'tube but I recommend it. Fun, crazy map.
https://www.youtube.com/watch?v=UFhUSsa12Es&ab_channel=WhamNinjaMolehill
Congrats and make sure and update us on the next version or final.