You opened Pandora's Box by adding the player WG option, I can't imagine it's easy to balance with the rest of the game. It's clearly not the focus of the game, but it's so well done that I can't help but greedily want to see it expanded even further.
With the WG player in the Dizzy facility, I think it'd be better if there were just a game over when the player reaches the same narrative endpoint as the other girls. That would better reflect how irreversible the process is painted in dialogue (it's not actually irreversible because of the metabolic thingy, but still), and if you're doing a feedee character, this is definitely going to be where you stop playing or start a new character.
Will NPC feeders ever get the ability to start their own Dizzy chains? They earn the same upgrade but it seems they never make use of it.
Have you ever considered starting a Patreon or charging for new builds? This is the best game of its kind and you're almost unreasonably generous by making it free!