Thank you for playing!
No, I don't think default Bitsy could handle it though I have been surprised by people's ingenuity using it before. There is a 'morph avatar' function by the looks of it, but I assume you'd also need to make an ending for each place you put the bone..? It could get very convoluted. You could probably do it with the Borksy hack 'edit room from dialog' function I think.
I would definitely recommend Mosi if you want to do more scripting intentsive things with Bitsy. I've tried Bipsi a few times, but I find Mosi very easy to use. It has a very good documentation too.
As for the outcomes, there is a 'good' and 'bad' outcome, depending on how anatomically correct you are. Though it's mainly only the dialogue at the end.
And yes, thank you for pointing that out about the human bones. In a rush to finish it in time I didn't playtest enough. After playing around my skeleton ended up with two pelvis' so clearly something is wrong. I will fix these issues and think updating it with the other comment's inputs too.
The other commentors also ran into problems, so just want to thank you again for playing despite the issues!