
Also known as "Woolie's Paradise" by nobody
Downpour is a difficulty mod that reworks the current leveling system to encourage fast-paced gameplay. The goal of the mod is to make the early-game easier while farming gold for items and staying ahead of the curve a choice players have to make constantly. Remember, leaving chests behind is a viable strategy in Downpour. you will have to give up some loot to stay ahead of the scale.
Also changes simulacrum to be much faster paced. Aim for wave 50!
+Also changes gup to be less tanky but more dangerous on split.
(Click for video)

It looks daunting at first, but to point out the important parts:
This leads to full clearing the stage being objectively more beneficial than rushing, players often do not have to think whether to move fast or farm money for items to stay ahead of the curve. Also, since stage advancement is the only exponential source, you outscale the enemies easily after the first 5 stages. This makes looping feel boring often. With the level cap, this problem is exacerbated.
Now, let's look at vanilla's Simulacrum scaling.

This one does not take players or time into account at all. This makes some sense since Simulacrum wasn't meant to be played with people. Anyways, neither of the scaling functions are fast enough to keep up with the exponentially scaling player.
Okay, time for Downpour's changes. starting with normal runs...

Even scarier, but here's the important part:
Generally you're expected to keep up with the permanent scaling, denoted by "Exponential Difficulty Scaling" in the game. Don't be discouraged if you fall behind on Downpour (difficulty) though, it's meant to do that.
Finally, Simulacrum.

With the fast simulacrum changes and by making it use the default scaling function with modifiers, Difficulties feel just like the one from the base game, making it more seamless to play. All values with "Scaling" on it is configurable.
4ba - Simulacrum Ending > Ending Start Wave and 4bb - Simulacrum Forced Boss > Forced Special Boss Start Wave to 50 for a finite simulacrum experience.Mechanics : Scaling from WRB settings if you want Downpour scaling on non-downpour difficulties. Simulacrum will still be governed by Downpour settings.