Nice atmosphere! I liked the forest setting, the fog, and the idea of the beast being inside the cabin. The moving grass and the player shadow also add a nice touch.
I think the main thing that could be improved is the interaction flow: picking up and feeding the apples felt a bit slow/confusing at first. It would also help to have a clearer end screen or a restart/quit button after winning, instead of needing to Alt+F4.
Good job for a 3-hour jam!