Weapons: Nice to have that many options, even if some are situational and others lose their appeal. Wraithverge primary fire seems a bit OP given how much mana it costs and D'Sparil's staff is a bit OP with the altfire, especially when tomed (can pretty much go and make coffee while they kill the green chaos serpents at the end). I'd either tone the skull wizards down, make it cost more mana or (preferably) limit the number that can be summoned at once (like with my summon spell).
The 4th weapons are meant to be a little OP. The gold mana they use will be more rare than the other two types, and the combined mana a real prize, since it gives all three types. The summoned wizard are supposed to have a time limit, but it doesn't quite work all the time. I've also tried to make a summon limit, but that didn't go well. Now that you mentioned your summon spell, I might try looking at that for some ideas.
Enemies: Pretty good variance with some nice new ones (the lava stalker is a neat idea, as is recolouring the centaur leader) even if the new ones (gargoyles aside) seem to be palette swaps of each other. (that's just a personal thing though, you know how much I like to add new sprite sets altogether

). I do like them dropping random items though, gives incentive to kill them.
Well, I really don't prefer a true palette monsters (i.e. baron/hell knight). There are some differences between the monsters. Some, not very much, while others are quite different. There's also some new sprites as well. Most of them I haven't added yet, or won't show up until later on though. For instance, the unused gold egg sprite now has a use: morph shield. And you will likely need it starting around the third hub.
Items: The new items are good, and I like the fact the charm spell works every time now as well. I love the new torch, and the fact that there are dark places that actually need them. Some are a bit too powerful though - the hold spell and timestop both last too long IMO (and the latter works on bosses which makes it easy to cheese them). I would also recommend using my code from Serpent (or some variant of) to make torches last between maps in the same hub.
The hold spell seems just right, and it doesn't affect bosses (skull wizards aren't considered boss monsters). The time stop might be a bit long though. I might either shorten the duration a bit or remove a couple of them.
I feel that most of the items are too common also...at the end of the 2nd hub I had well over 10 of everything except torches and the really rare stuff, and never spent a single gold/silver coin except for the puzzle piece in the 1st map. I would certainly suggest making some items rarer, especially tomes.
Yeah, I've been trying to cut down on the number of things lying around. There was a lot more earlier. I don't want to have too many things, but I don't want to have too few either.
Shopping could use a revamp too (buying 5 health potions or large blues etc. is slooooow), although you've probably got this planned anyway given how the shop looks in the 3rd hub. A disc of repulsion isn't worth a silver IMO, probably a bronze instead (or remove it from the shelf altogether, as they're common anyway).
Yeah, they are a bit slow. I'll speed them up some. As for the discs of repulsion, I've been thinking about what to do with those. It's not so much that they're common. It's that they aren't really that powerful. I guess I could remove them from the early stores. There's plenty of other items there to randomly choose from.
Maps: I did notice a few bugs (mainly light levels on top of bookcases in map 05) but aside from that, really nice looking and playing all the way through. I like the fact that you've gone with messages all over the maps (placeholder ofc atm), that adds a lot to atmosphere IMO. Mobs hanging around outside map 01's exit should probably be taken out IMO, and I would also make a separate decorate class for gargoyle statues etc. that don't animate. (as they confuse the mob count in each map and make me think there's still a load out there even when it's cleared)
I'm guessing you mean the bright light on the ceiling from the message book locations. That can be easily fixed. As for those pests at the end of map 1, they have always bothered me, especially as a fighter in JHexen. There wasn't any way to reach them unless they were close. I suppose I could remove the monster blocking from that line or bring them inside. Oh, and stoned gargoyles are a separate class (uses -COUNTKILL). The problem was with the buried reivers. Somehow, there was some old code left in which caused the incorrect enemy count. That's been fixed.
Overall I really enjoyed this, it's great just to play it w/o fear of losing my save game at any point...don't get me wrong it was innovative back then, but now the limits of Doomsday are gone I think this project will end up so much better. (and it's another example to disprove the "limitations breed innovation" theory that DW folk still cling to)
In my case, the theory goes something like, "If I can do this in vanilla Doom, just imagine how much easier it will be and how much better it will look in GZDoom." I've made some maps with limitations like that (i.e. 1monster). I prefer to think of it as a challenge. I especially like how maps 15 and 19 turned out.