The Frankenstein control physics is odd and we could've explained that better. When you press towards either arm (O or P), your monster goes in a triangle motion (imagine a basketball player doing a dunk). So you go up-left/right and then down. The speed and momentum is dependent on what body part you assigned and if you are pressing left/right simultaneously.
Thanks for pointing out that you didn't understand the mannequin UI... now realizing that I did not explain that anywhere (even in the written guide). The mannequin UI subtracts a body part whenever you pick it up. So if you pick up a torso, the torso is subtracted. A head is subtracted if you pick up a head. HOWEVER, it resets when you go into a house and leave it. It was originally designed so that you knew if you completed the minimum requirement [two arms and two legs, torso, head], to dodge the Igor ending. We did not prioritize fixing it because we had other fires to put out haha.
Thank you so much for playing and your kind comments!! I love Ed too. :') Was fighting myself on adding an Alexander x Nina reference since it kind of fit the theme of Frankenstein. Maybe I should've anyway.