Woah, this is really impressive! You've managed to make such an interesting system out of just four numbers. Attaching them to the card suits makes it so intuitive to pickup. I especially love how flipping a card makes you lose sanity. Its this constant anguish of wanting to see one more card but knowing its chipping away at you. It hits really nicely thematically and mechanically. The premise is so sick too, fighting sleep deprivation demons? C'mon.
thank you for making this, its an incredible entry!