Still looking for gameplay ideas? If so, here's a suggestion (otherwise ignore this comment, and thanks for the free game!).
An enemy that slowly strips the player naked over multiple turns (e.g. first you lose your jacket, then your top, etc.). They use mostly lust attacks, which do more and more damage as you get more and more naked. Flavor text could involve the player feeling embarrassed but aroused.
The more general version of this is to make a stripping attack that both the player and enemies can learn. But then you have to implement logic like making the slime immune, stripping enemies, having them react, and so on, so that's probably harder to do. Also, with the current random encounter rates, it'd be real annoying to lose all your clothes every ten steps. Maybe only bosses and rare enemies should use it against the player.