As a flash piece, this is very successful as a dark fairy tale. The protagonist makes an appointment to see some type of prophet. I think he/she/it is the embodiment of the sea. There are rules the protagonist jumps through to get this meeting, once “you” are there, you have precious little time.
This piece is written in the second person, but it doesn’t feel jarring, it works. The instructions the protagonist must adhere to are also presented well, and this piece gets a lot done in few words. The ending was a little bit puzzling, but that’s also what makes interesting flash fiction. It allows readers to imply their own, inviting readers to participate in the creation perhaps a little more than in longer forms.