Well that's certainly the obvious interpretation but part of what I love about the film is the way that you really can't say anything with any certainty. Almost everything is up for grabs.
Another thing, I love the way that the scenes in the desert convey this feeling of their having been travelling for ages despite the fact that the film is relatively short and these scenes are only a small part of it.
yep your quite right.
i'm totally tripping here but i'd love it if one of the big three (herzog, lynch, jodorowsky) continued from the shooting's narrative and made a film from the perspective of gashade's brother or the little alien.