Questions:
1: How many endings will there be?
2: Will there be other party members with their own storylines and interactions?
3: Will having too much Lust, Corruption, or Submission lock you out of other choices?
4: How many fetishes will there be?
Suggestions:
1: I know you are focused on "Kay" as a playable character and have Fox and "Fox's Love" as a major NPC and gameplay mechanic, but why not instead have Fox as an optional party member and rename the "Fox's Love" stat to just "Love" and have it act as a counterbalance to either the "Lust" or "Corruption" mechanics?
2: Have additional costumes and images based on what you are wearing, or rather what you aren't wearing.
3: The Lust, Love, Corruption, and Submission stats should affect combat and how you and your party fight.
4: A "Reputation" mechanic where your actions and choices determine how NPCs react to "Kay" and co.