I thought Arrival was a good spin on time-travel. The information travels backward in time, but it is resolved - a consistent timeline results (as far as we witness it, at least). Good sequel could be to fast forward whatever it was . . . 3 millennia and see the intelligent cockroaches from Earth arriving to save the hecapods after the knowledge the hecapods bequeathed led the humans to promptly self-annihilate, opening the path for cockroach evolution.