Hmm, regarding improvements or suggestions how about leaning a bit more into progressive cursed items?
For example, taking the cursed butt plug: the longer the curse remains unbroken, the more the item could evolve. It could start as a regular size, then grow larger over time, or even transform into something like anal beads, becoming bigger and thicker.
You could apply a similar mechanic to the slime breast by making it expand, or perhaps have it create a slime-based chastity cage that prevents the protagonist from using their penis.
Overall, I would really love to see more cursed items that actively force the character into more bondage gear while inflicting debuffs that get stronger over time. Thank you for your hard work on the game!