There is body language
#Clearing some doubts
split wraith
You can generally tell what they're feeling based on how they look
Pay attention to their faces/eyes and what they're doing with their arms/weapons
sly bolt
I see, ty for the info, I will pay close attention when I see them again
stable island
Most creatures and interactions in the game are intuitive 
You can read what animals are doing from their expression and motion
sick nexusBOT
Reposted starting message
Hello everyone, I bought Rain World some days ago and starting playing, after some time (after dying a lot) I come to find the scavengers, I know that you can be friendly with them ( I did see some non commentary gameplay of the game prior), but how can I know they are hostile or friendly, is there some body language or something that shows they are hostile or friendly?
fathom marsh
resent the starting message since it's visible outside of the thread, and contains some minor gameplay spoilers like scavs and behaviors 
(you're not in trouble or anything i just thought i'd explain why it got resent if you were wondering about it)