Peter Debruge Chief Film Critic Got trauma? A global alien invasion is all it takes for emotionally scarred Brynn (Kaitlyn Dever) to sort through her issues in “No One Will Save You,” an extra-terrestrial creature feature cut from the same cloth as M. Night Shyamalan’s “Signs,” where the jump scares are secondary to an earnest (but far less effective) portrait of coping with guilt and grief. Building on the novelty value of 2020 debut “Spontaneous” (in which a bunch of teenagers inexplicably start to pop like pimples), director Brian Duffield sets multiple creative challenges for himself and mostly succeeds — well enough to attract eyeballs to this buzz-worthy Hulu release, at least.