Ok our discord got together and finally managed to play the campaign in versus. I will be compiling a list of issues that I and other people had.

First issue: The length of the maps. The maps are short enough that getting to the saferoom in versus with all 4 survivors is pretty common. This is something I've even noticed in campaign, where the maps length leads to them ending too quickly for the maps to wear a team down to the point where they will be defeated. I think every every map, 1-4, could perhaps be slightly extended without hurting the difficulty balancing between campaign and versus.

Second issue: Some areas just don't have enough locations to spawn in versus. I think this is something that will naturally be addressed as you update the maps to have more objects though.

Third issue: Lift still gives way too many points for being entirely free. One of the people playing the match said that there was supposedly a fix for this, so it's probably possible to make the lift give 0 points. I do appreciate that the lift goes slower while still covering a distance though, in the first iteration it was so fast that it was kind of absurd and it still took a while.

Also it would be nice if there was a way to spawn above the lift in Versus so you can ambush the survivors easier when they get out. The only other way is to spawn directly outside the tunnel where it's hard to attack from.

Fourth issue: The catwalk room above the bus needs more areas for infected to attack from, maybe some boxes up top or something. If the tank spawns here it's entirely useless and the infected team can't spawn anywhere to support it. Also it's a much easier drop than the other side because of this.

Fifth issue: This one is a bit of a personal problem, but the holdout at the end of the Map 2 is just too easy. Most of the infected funnel in from one way especially if you don't open the gate on the right to go back for ammo. Very easy to stay in one spot here and not do much. No real specific feedback on this one.

Sixth issue: The finale is way too easy, in campain and versus. In campaign is very easy to camp up high, especially on the fences up top and stay there the entire time until tanks and the finale area gives you a LOT of room to kite the tanks around and maneuver (which isn't entirely bad especially with 2 tanks). I feel like the layout of the finale needs to be updated a little, perhaps with more ways for infected to get around and cover that is harder to defend from all angles.

This issue is even more prevalent in versus. It's so extremely easy for survivors to camp up top in the building on the left that infected can barely even teach them there. Tank doesn't help that much, just way too many easily defensible areas that have no risk.
People in the discord server I play with aren't huge fans of static holdouts but everyone in the lobby unanimously agreed that they did not like the finale, especially for versus and they found it annoying as infected and boring as survivors.

Now I want to be clear, I still think this is a fantastic campaign, but these are some of the problems that came up on the most recent playthrough. Some people did enjoy it but had a lot of problems with the general design.

I think honestly that as far as just campaign goes the finale needs to be altered. It's an interesting layout but it doesn't provide much challenge.

I don't know how worried you are about versus play for the campaign but on that side of things there are a lot of potential issues. I think fixing some of them is as simple as continuing to work on the campaign and fleshing it out, but the length issue is one that would require actively reworking parts of each map.

Regardless, this is just the feedback I have for now. In the future when this is updated (or if I find anything major between now and then) I will play again and hopefully come back with more helpful feedback. Keep up the good work!

Edit: I would have posted this as a comment instead of a discussion but it was simply too long to do so.