Pretty neat game! Loved that it was basically a really cool boss rush where you get stronger and stronger as you fight in order to fight a big boss at the end: definitely my cup of tea! Loved the whole atmosphere to the game and all the cool touches to it, like the way the house shifts as time progresses, how you can't eat your own heart if you try, and how the timer changes on the last day.
Combat was decent, but a bit of a mixed bag. It's certainly alright, and has a lot of neat upgrades as you go, but it felt a bit annoying to not be able to move in a separate direction than you can shoot, and the camera just feels way too zoomed in. A lot of the fights started to feel very samey as well: mostly devolving into the same strategy of circle strafing very similar bullet patterns in the same cramped cellar you have to fight all of the demons in.
Pretty odd at times: really didn't grasp the systems initially as it dumps a lot on you quickly and I didn't like how you can totally softlock yourself by running out of resources which forces you to sleep over and over with no way out. Maybe it'd be nice if you could get yourself out of a softlock by sacrificing some blood/health to summon a boss as a last resort, or at the very least, maybe instead of being forced to sleep bit-by-bit, the game notices you softlocked and just fast-forwards you to the last day?
This is a bit silly to say, but it might actually be a bit too easy? I was just playing around and intentionally softlocked myself early on by wasting resources and just slept until the final boss since I was curious how hard it was gonna be. Well, the answer was that not hard because I destroyed 'em on my first try even with my gimped character (well, he still had a few upgrades, but still)!
Anyway, I griped a lot there, but I still had a great time with this, so well done!