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That's funny, actually. I was kinda thinking the exact same thing! Multiple days, and each day would maybe have a time limit, where you'd try and get as much pleasure out of her before the timer ended, and use that as your currency in a shop. Although, that is still a bit incremental-y, but I think it'd be pretty fun! As long as you handled it well and didn't give too short/long of a timer (probably you'd be able to upgrade your timer with currency).

Multiple characters would be great! And maybe you'd have it so that each character had an associated doll, and thus an associated "effect", in order to cut down on the amount of art you'd have to do for each state of breast expansion+wetness amount+cumflation+whatever other TFs you'd be doing. This way, you'd only have to do the wetness art for girl A, the breast expansion for girl B, and the cumflation for girl C. Or, if the wetness would be a constant, you'd still be cutting down a bit in case of other future TFs. And you could still make it so that you could get multiple dolls for the same character later on in development, and have a BE mode and a cumflation mode, or something along those lines.

For story, I can imagine this shady voodoo doll shop that sells voodoo dolls and accessories to kinky couples and regular pervs alike. But, all the voodoo dolls there were made with hair samples (or whatever links them to a specific person) given voluntarily by girls/guys who want to get played with and transformed. And that'd also give the reasoning for the TFs being girl-specific: the girl came in and said "I want my voodoo doll to be one with fuckable holes" or something along those lines.  That seems like a great extension of this game's story into multiple characters, without randomly creating an inexplicable harem. Honestly, I bet there'd be lines out the door if that was something that existed IRL (or, maybe digital waitlists with so many visitors it crashes the server? That seems like the sort of thing that would be super embarrassing to do in person, lol) 

I am curious about what your other story idea was, though. And by all means, take a moment to rest your creative batteries! Even if I'm super excited to get to feminize a femboy (or femboy-to-be) via voodoo doll. You did good with this banger of a game, and I think I'll manage to survive the wait for the sequel/update.

Oh, but to give you some less-grandiose ideas, one way I thought of to have the late-game be less "spam nails until you get to 100" would be something along the lines of "sensitization pins", which wouldn't do any arousal on their own, but would increase the power of clicks/pins in an area around them (0r maybe just the whole doll? So as to not incentivize people to place all their pins in the exact same spot. ). And also, you could make the orgasms with at least one nail in count as two? They seem like they're strong enough to count for more than one. And that'd let you end the game at a "lower number" without actually having it not end at 100.

And, for the visual aspect of sensitization pins, they could make the nipples even harder when enough are placed near/on them. And do the same for the clit, too, perhaps? That doesn't seem like it'd be too much work to add, in terms of conflicts with the base wetness progression.

I imagine you might get them (in this version of the game without a shop) by trading in some number of your basic pins. Maybe 5? I suggest this because having to put all your pins back in after using a nail becomes a major pain later on, or at least it would if nail spamming wasn't the objectively correct way to go in the late game. So if you decide you want to "fix" that and change up the late game, this would be a pretty good way to do it.

Another way to "fix" the  endgame that I thought of could implement the "edging" that we mentioned before. Maybe successfully edging her would permanently increase her sensitivity? That would counteract the much higher arousal required (or, decreased arousal gained? It's hard to know when it's measured in percents) for the final stages. But, that would require a way to remove all pins without adding a nail, so as to stop all stimulation when on the edge. You could just make it so that nails themselves are manually removable, that way you could: add a nail to remove the normal pins, then remove the nail itself. But importantly, it'd add a mechanic that would need a tutorial in a notably tutorial-free game.