I vaguely remember watching a short film that was posted on Facebook a couple of months ago (it was around 10mins long). I think the film is narrated in French (definitely not English) and it starts off with a crashed spaceship on a barren alien planet. There is only one survivor who has ended up quite a distance away from his ship (he is wearing a full white space suit with helmet so you don't see his face). He is running out of oxygen so he starts to run to find his ship, but he is being pursued by an Prometheus-esque alien (that you don't see for a while). Whilst he is running, the narrator describes the man's situation and what might be going through his head. The narrator then says "no, no, no. You're not in a stranded on a planet, you are..." and then it cuts to another scene/situation based "reality."
Again, the narrator goes through the scene, but then say "no, no, no..." and it then cuts to another different scene/situation. There are about 4 or 5 different stories which the film then cuts in-between as each slowly develops.
From what I can remember, the astronaut passes out at one point and the alien burrows into his space suit. When he wakes up, he starts to run again and the narrator describes how "you're trying to ignore the thing crawling up your leg" or something like that.
Does it ring any bells with anyone?!?! I've been racking my brain trying to find it online, but my search keeps bringing up "Grounded" and "Seed," which it isn't. The person/group/sponsored Facebook post did comment on how similar the planet and the alien was to Prometheus.