That shadow beast sure came outta nowhere! Started so light and positive, wasn't expecting anything but uplifting feels and... apparently that's what we get after all! Impressive how well you captured a sense of the unknown here. How off guard you can be when things don't follow that predetermined pattern, that mice are harmless; that monsters are not... goes to show to never judge a book by it's cover too.
I love the twist this took, and how well you built the atmosphere throughout. Amazing work.