"Not a very good science fiction movie but a fun feel good movie." I never claimed it wasn't science fiction, I just said it wasn't very good science fiction.
I can add on, here's the story. Hey random guy that had an idea once, teach our astronauts that idea! Nevermind that people in the real world don't think that non carbon based life is impossible. Wait, your idea isn't relevant, they are carbon based. Oh no, the ship blew up! Looks like you, with no training and no relevance are our best option! Everyone dies in the space ship but him. Meets rock. Let's learn to communicate, because that's not a totally normal thing to attempt or whatever... and I'm awkward. Magical space communicating science happens! Maybe the only science fiction thing in the movie other than the particles. Etcetera. I liked the movie, it just happened to be in space instead of a uncontacted tribe on earth or something. That's fine. I wish they would have shown their essential differences more, both in belief and tech.