@Zephiar Well, for starters:
- The Ghosts have more projectiles and corpuses for the 2 stronger ones
- The Slayer's ranged attack has been improved
- The Husks now have a liking to the movie "Holes", if you catch my drift.
Of course, there's a couple more changes, esp. for the Zeds, but you'll have to find them out yourself ;)

how do your mods make it harder though?

@Zephiar it makes it harder. It's based off the Binding of Isaac achievement of the same name.

okay but what does it actually do though