I think you should add more effect like blurry red on the screen at the monster maze when the monster is near so you will know it's here, add scream of the monster to make it as realistic as possible.
For the black demon in the ruin section, I think you should add a scream to it to make it as scary as possible.
Death animation is also something to add in. For example, if Lacie died to Kett, then there should be a blood pond and her clothes here but torn up; for the spikes, she will die to them with a lot of spikes going through her body; and last but not least, for Miss Knives boss fight, a knife will cut her body in half. By adding these, we will make the game better!
Also, extend Miss Knives fight more because I felt it was too short!
Nice game btw! I'm so hyped for the final product!