What are some cool uses/levels of the Doom Engine you'd like to see?

Game here: https://www.roblox.com/games/273735085/RooM-V1-96-Alpha-Testing-backup

Obviously this is just a demo but once there's a skulltag/doomsday Doom Engine on roblox... what then?

I'm going to make a campaign obviously, but I would like some feedback from u guys. Remember that eventually the engine will be released for free with a "modding manual" so anyone can make a "WAD".

I'm thinking horror games, hangouts, endless survivals, joke campaigns, terry wads, and even tycoons tbh.