Just played through the game, and man was this an experience!
I have a few suggestions though:
1. Maybe you could make four more models for the hookers? I mean, it's just the same one each day.
2. Regarding the killing minigame, maybe you could make it harder with each day and a few more slashing/stabbing effects?
3. Maybe an option for a different ending, even a boss battle with the "possessed hooker"?