im a bit late to this but more than likely its a chain of wishes, jinnys wish would be to save the main character ( since you know) which would make it understandable on why halley can rewind time. the only problem im having is with the main character, all wishes symbolize their wisher in some way (echo has a noose around his neck not sure about halley bur bare with me) this makes sense. but halley in the start of the game said something along the lines of " echo is a useless wish " and "he would turn into something vile" or something along those lines, even though later she confirms she doesn't keep her memories. but echo also confrirms that remnants are " dead wishes " so wouldnt that mean, in some shape or form the remnant is the mc's " dead wish ". this would also imply that echo is going to (or already has) turn into a dead wish (since you know, grandfather paradox).