Can you repack the file without the folder, so it can be used with the Quake Injector?
Not bad for a first release. Feels a bit like Doom map in style with its nonchalant combination of textures from various themes.
I think it could have been done without exceeding the vanilla limits, but that shouldn't be a concern right now. Tip: if you have large void rooms with solid black walls, increase the texture scale to something high (like 99) to lower the polycount. Check with r_showtris 1 to see how QBSP produced many polys where it could have been two per wall.
Lighting is quite flat, don't use minlight. For example, the death pits should fade into black instead of showing the bottom. Some areas look unnecessarily "low-fi", because the lack of contrast highlights their simple architecture.
Gameplay is tough but managable on hard skill, plenty of ammo, and some cool secrets. I immediately made the connection between the RL and the pent at the beginning, but unfortunately didn't find the way to get the RL.
Careful when using fiends (and dogs) on uneven ground, tight walkways or areas with gaps in the floor. They can't land properly if the floor bit is too small for their bounding box to fit which makes them keep jumping and this can lead to instant death if they hit the player.
I encountered a strange bug in the room with the Edie/SNG secret above. Picking up the rocket box warped me into the adjacent room and I got stuck there as if trapped in a push trigger, unable to move or shoot. Even noclip didn't help. Preach please.