If you are looking to code these into the game's engine (likely Ren'Py or a similar framework), I recommend starting with a . This ensures that any new feature you build can "talk" to existing systems like the Lust or Corruption trackers without breaking old save files.
Since the game involves many characters and "seeds," allowing the player to customize the skills or traits of their subordinates would increase replayability. Seeds of Chaos [v0.3.10]
To add more depth to the world-map gameplay, you could implement a system where the player dispatches hired hands or corrupted servants to handle side-missions. If you are looking to code these into