Hey! Sorry for replying to this SO LATE but I made a guide specifically for folks like you who might struggle with Folly as a devlog! I put all the ways cuz there are multiple ways to do so :]
Short answer, don't kill the centipede :] I hope the guide can help you!
I dont know if its a bug on my end but I tried doing the completionist route multiple times and folly still starts with zero hearts, idk if I'm doing something wrong or?
I hate to be that person but did you update the game? The previous versions were slightly bugged (oops) which is why you should update to the newest version as stated in the guide!