The film was set on a alien planet where human soldiers fight against giant translucent red aliens with tentacles. They show up at sunrise or sunset (I'm not sure). They are deadly if touched.
I think this is a 2000's film.
I recall one scene where a red monster rises up behind a hill and it is huge (much higher than the hill).
Another scene features soldiers escaping in a jeep while shooting at a monster.
Apart from it being set in Mexico, not an alien planet, this reminds me very much of Monsters (2010).
It has giant translucent red aliens with tentacles.
They show up at sundown.
They are very big.
There is a scene at the beginning (and also at the end) with soldiers in a jeep attempting to escape down a road while they shoot up at one of alien lifeforms
IIRC there are also warnings about them touching you.
