Some players report a bug where the game freezes after Day 3 when trying to sleep. If this happens, try loading an earlier save or checking for the latest Steam Update which addressed achievement and progression bugs.
This game is light on resources, requiring only 4GB of RAM and 1GB of storage space. Guide :: Updated Walkthrough - Sweet Dream Succubus
This ending requires you to experience every romantic scene and avoid banishing her:
Stay at home and don't sign for the parcel. Visit the Library and then go to the Movies .
To defeat her, you must learn the banishment ritual from the Church: