I think you need a “get started” video or something, for people who aren't familiar with your favored constellation of mods, especially since you'e changing the some core game behaviors pretty radically. 

Here's some questions I have (or had, if I figured it out I put the answer in parentheses):

• starting out:
• the FOV is weird and there’s no cursor (still not sure, it makes the changes to gathering below extra frustrating)
• wheres the HUD? (found that - Hit the Y key, experiment)
• why do I take damage when I punch some blocks? (Maybe similar to no tree punching, ok but) and
• why do I take damage when hitting trees with a wooden pick axe? 
• What do you mean by “load a saved slot in NEI”?  There’s no saved slots listed anywhere... 

this modpack changes a lot but doesn’t explain why, and most of it seems arbitrary without an explanation.  

The idea of taking damage when you hit blocks with your hand or the wrong tool (e.g. if you click ) is especially frustrating in the early game, even more so when you aren't sure what the rules are for damage taking. 

In reply to hanleybrand:

 Additionally, the modpack crashes a lot.  I have a couple of these "ticking screen" crashes - 

---- Minecraft Crash Report ----
// Oops.

Time: 2019-10-04 21:55:03 EDT
Description: Ticking screen

java.lang.NullPointerException
    at de.maxhenkel.corpse.gui.GUIDeathHistory.updateScreen(GUIDeathHistory.java:152)
    at net.minecraft.client.Minecraft.runTick(Minecraft.java:1779)
    at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1098)
    at net.minecraft.client.Minecraft.run(Minecraft.java:3942)
    at net.minecraft.client.main.Main.main(SourceFile:123)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
    at net.minecraft.launchwrapper.Launch.main(Launch.java:28)


A detailed walkthrough of the error, its code path and all known details is as follows:
---------------------------------------------------------------------------------------

This pack looks interesting, but it needs a good deal of refinement (you have 4 backpack mods to pick one example), be more selective, maybe narrow your theme a bit to find a core of mods that you actually need to get across your idea), and then some more documentation than you have.  It might seem like you've created a "challenging" modpack, but currently it's mostly a challenge of googling trying to figure out what mod is causing x to [be different/missing/appear] mixed with the challenge of not cursing when the game crashes (partly because it takes 5-10 minutes to launch.)

Looking forward to seeing this pack after a few iterations!