The Serious Sam 4 Workshop has a decent amount of mods to choose from, unfortunately when I tried to play modded co-op tonight the game threw an absolute shit fit. Despite both clients having matching assets a connection couldn’t be established. It wanted to redownload mods it thought we didn’t have, and send the game into an infinite crash loop. I’m hoping this gets fixed, single player modding works, but it’s always better when you have a buddy at your side to share in the shenanigans.