I just played this and it's great. Absolutely brutal, I almost killed myself one-shotting a boar with the Super Strength power and then spent a day desperately grubbing for safe food in order to eat enough to recover. The amount of power you can bring to bear on a problem with energy, compared to how scarce energy can be, is brilliant - I felt like an unstoppable badass and a bottom-feeding prey animal in the same short session.