Originally requested by @atomicblaze21

After purchasing Performance Pills, it should be an option to enable/disable extra hearts. The implementation of such a feature could either be an all-in-one toggle to enable/disable extra hearts as a whole, or something more akin to a slider where you choose how many extra hearts you want to use out of the ones you own.

This is a good feature to add because these extra hearts are likely to be used as "training wheels" for new players, but they may want those training wheels to be removed once they get better at the game. As there is no way to do that currently without wiping the save, an advanced player may be stuck with a previously needed but now unwanted crutch.