Hey there!
Took a look at the game's code and unfortunately it doesn't seem like it's gonna be a easy way to add difficulties back.
It's fine..thanks for the effort!
I'm noticing that as you progress through the game, (From Act 1 to 4, it gets harder and harder. (Seems like they reuse the same variables and probably difficulty settings.))
1- They're 3 acts, not 4.
2- I'll just assume that you didn't play the game.
Here's the thing: as we progress....
we also get stronger....and we get much...
MUCH stronger than them..From level ups to Weapons upgrades and perks.
Unless you (not you in particular, I mean the player.) give zero fucks about the gameplay and just want the scenes. 1-shotting bosses isn't as entertaining as it seems........
Again, thanks for the effort!