It's really cool and I love the atmosphere! I do suggest maybe giving a few more audio cues, like for when ghost peach is around or when she's coming after collecting a statuette. Maybe have each one make their own sound that alerts her, because on first attempt without knowing she comes whenever you pick one up, you basically get blindsided without warning.
But in general, this is a really good game and has a lot going for it keep it up you have the right atmosphere and tone going so far, and its really fun and scary to play!