i know your already making this game but i think you should make a game about being a demon of slunesh and your goal is to keep hidden you first start off as a civ then you pick a role to join so inq marine eta eta
and you work over time dodging the higher ups but keeping some balance so the imperium dont just burn the planet you have to focus on 2 main things change the people as well as blinding the higher ranked people in a hive city you blind them thru diffirent demonic powers basicly each higher up has their own desires and you talk with them then use some magic to find out their desires then set it up and invite them
this will make them turn a blind eye to your activitys at which point you want to corrupt the people to enjoy love lust and pure on breeding
you could also maybe gain comaions who become your servants
you could also make it so since we are a demon we could pick futa female and male
and we could change our compaions to