The style of the game is great! The art is really beautiful, and I like the concept of sacrificing animals to make it through the rest of the days. In that way, it plays into the theme quite well.
I wonder if it could be interesting to add in random events in between the days. Almost like the "event" spaces in Slay the Spire or Inscryption, which add a little bit of variety to the core gameplay loop. I also wonder about having the difficulty ramp up gradually, so that more complicated / difficult enemies don't spawn until later. Those could be some ideas that could make the game more replayable after failing some attempts.
Great work!