A very, very good movie with a powerful message. I loved it. I don't know why there are so many bad reviews. Maybe some people didn't understand it or lost concentration?
Yes it borrows themes from Close Encounters, Interstellar and there's a smidgen of Stanley Kubrick's epic 2001: A Space Odyssey: but by no means is it a cheap copy. It very much has it's own agenda. It knows just where it's going from the opening frame and takes us there to the very end.
A hidden gem. A beautifully crafted story with a truly emotional ending.