I just found this game recently & wishlisted, loved its gameplay focus.
My only suggestion will be add/implement a playable male gender ingame.
Take for reference on "slaves of rome" which is a game on steam. It's gameplay focuses on slaves we must train, selling slaves, & have sex with them on our main character's dungeon. The game offers playable genders for us player's to select ingame like male,female, & futa female.
The reason I recommend taking "slaves of rome" as a reference is because both chains of bondage & slaves of rome have similarities due to their BDSM sex scenes & sex positions featured ingame.
Wishes you well on your game development progress and success