I've been trying to use this mod and have tried installing NT, NTT, and NTTE all over again now, but whenever I go to the main menu, the mod completely unloads itself from the game, and will also unload itself if I quit out of a run. If this is by design, and you're meant to /load NTTE before each run and each time you launch the game, it definitely makes it very hard to play, but if not, any idea how to stop the problem?
That's just how Nuclear Throne Together works, but if you want the mod to auto-load when you go back into the game you can create a file in your mods folder called "startup.txt" and put commands (like "/load NTTE") in there which will run when you open the character selection screen
I'm not sure if there's much reason to go back to the main menu though besides settings, but you can access that through the pause screen if need be